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# How to calculate the volume of gas

### Molar volume of gases - Formula mass and mole calculations

One mole of any gas has a volume of 24 dm3 or 24,000 cm3 at rtp (room temperature and pressure). This volume is called the molar volume of a gas. This equation shows how the volume of gas in dm3 at.. This video covers:- How to calculate the volume of a gas using the equal: volume = moles x 24- How to find the volume of a product when you're told the volum.. The volume of gas produced during a chemical reaction can be measured by collecting the gas in an inverted container filled with water. The gas forces water out of the container, and the volume of liquid displaced is a measure of the volume of gas volume: n = mole: R = universal gas constant: T = temperature: ρ = density: R specific = specific gas constan Note that volume is measured in metres cubed (m3) and temperature in kelvin (K). This means that if a gas is heated up and the pressure does not change, the volume will. So for a fixed mass of gas..

### GCSE Chemistry - How to Find the Volume of a Gas #6

1. The combined gas law formula states that with a constant quantity of gas the gas pressure multiplied by its volume and divided by its temperature is also constant: The appropriate formula from the ones listed above is chosen automatically when you use this ideal gas law calculator. Applicability of the ideal gas formul
2. Using the Ideal Gas Law, you would find the volume of 1 mole of a gas at Standard Temperature and Pressure (STP). STP = 1 atm of pressure and 273 K for temperature. P = 1 atm V = ??? n = 1 mole R = 0.0821 atm L/mol K K = 273 K. #P V = n R T # solves to #V = (n R T) / P
3. To find the volume of gas available from a compressed gas cylinder, we apply the Ideal Gas Law (PV = nRT). In a high-pressure cylinder, the volume will be affected by the content's compressibility factor Z (PV = ZnRT). For example, an AL cylinder of pure helium may contain 134 cu. ft. of gas while the same cylinder of pure air may contain 144 cu
4. 1 mole of an ideal gas (1) occupies a specific volume at a particular temperature and pressure. This is known as the molar volume of gas and given the symbol V m The units most commonly used for molar volume of gas, V m, are litres per mole, L mol -1 Examples of molar volume for ideal gases (V m) are given in the table below

### 6.6: Gas Volumes and Stoichiometry - Chemistry LibreText

1. You can measure the volume of a gas with a balloon and some quick math. First, inflate a balloon with the gas you want to measure, and tie it off. Then, you'll need to measure the balloon's radius. To work this out, sandwich your balloon between 2 flat objects, measure the distance between them with a ruler or measuring tape, and divide it by 2
2. Density is mass per unit volume. Finding the density of a gas is the same as finding the density of a solid or liquid. You have to know the mass and the volume of the gas. The tricky part with gases is that you are often given pressures and temperatures with no mention of volume
3. e the fraction of produced gas and condensate in the reservoir fluid stream. 13
4. The Combined Gas Law shows that the pressure of a gas is inversely proportional to volume and directly proportional to temperature. Avogadro's Law shows that volume or pressure is directly proportional to the number of moles of gas. Putting these together leaves us with the following equation: (11.9.1) P 1 × V 1 T 1 × n 1 = P 2 × V 2 T 2 × n
5. To find any of these values, simply enter the other ones into the ideal gas law calculator. For example, if you want to calculate the volume of 40 moles of a gas under a pressure of 1013 hPa and at a temperature of 250 K, the result will be equal to: V = nRT/p = 40 * 8.3144598 * 250 / 101300 = 0.82 m³
6. The storage volume for a compressed gas can be calculated by using Boyle's Law. p a V a = p c V c = constant (1). where. p a = atmospheric pressure (14.7 psia, 101.325 kPa). V a = volume of the gas at atmospheric pressure (cubic feet, m 3). p c = pressure after compression (psi, kPa). V c = volume of gas after compression (cubic feet, m 3

The volume of the gas is V = 5 L. Calculate the volume of this mass of gas under normal conditions (P = 100 kPa, T = 0 °С). Solution: Click the Reset button and enter the problem data into the calculator: Select the n (Amount in moles) in the Select an unknown selector. Enter the pressure P = 500 kPa. Enter the temperature T = 15 °C To calculate volume of an oval tank find the area, A, of the end, which is the shape of a stadium, and multiply it by the length, l. A = π r 2 + 2ra and it can be proven that r = w/2 and a = h - w where h>w must always be true. Therefore

At STP, a mole of gas takes up 22.4 Liters. The 22.4 Liters/mole quantity can be derived from the Ideal Gas Law, PV = nRT, plugging in STP conditions for P and T, and solving for V/n, which gets 22.4 Liters/mole. To find the exact volume of your. The density of gas can be calculated by the Law of Avogadro's, which says: equal volumes of gases, at the same temperature and pressure, contain the same number of molecules. This law implies that..

There are three common formulas used to calculate specific volume (ν): ν = V / m where V is volume and m is mass ν = 1 /ρ = ρ-1 where ρ is density ν = RT / PM = RT / P where R is the ideal gas constant, T is temperature, P is pressure, and M is the molarit Stoichiometric Calculations Involving Ideal Gases at STP. Stoichiometric calculations involving gases allow us to convert between mass, number of moles, and most importantly, volume of gases. The following relationship makes this possible: 1 mole of any gas at standard temperature and pressure (273 K and 1 atm) occupies a volume of 22.4 L The latter form of the equation can be used to calculate molecular mass from experimental data because moles = mass / molecular mass = gas volume / volume of 1 mole mass / molecular mass = gas volume / volume of 1 mole molecular mass = mass x volume of 1 mole/volume To calculate volume in litres, first convert the dimensions of the object into centimeters. Then, use the volume formula to calculate the volume of a shape. For example, to calculate the volume of a cube, you would use Volume = length times width times height, and your answer will be in cubic centimeters Using the Ideal Gas Law. Let's start with a very simple example to see how this works. Say we want to calculate the volume of 1 mole of gas at 273 K (which is the same as 0 °C) and 1 atmosphere.

The volume (read on the meter) is multiplied by the mean value of the energy potential of the gas during the period in question. Your network manager, Sibelga, performs this calculation. One m 3 of natural gas contains between 9.5278 and 12.7931 kWh depending on its type To express the volume, we use cubic units (for metric cm³, dm³, m³, and for imperial in³ and ft³). To get proper results, use one unit consistently throughout the whole computation. The formula for the volume of cylinder is: cylinder volume = π * radius² * height This corrects the volume of gas to account for temperature and pressure (as gas expands and contracts). Step 5. Finally the figure is converted to kWh by dividing by 3.6. Again, this factor is. Molar volume of a gas is defined as the volume of one mole of the gas. Thus, the molar volume is also the volume occupied by 6.02 x 10 23 particles of gas. The molar volume of any gas is 22.4 dm 3 mol -1 at STP or 24 dm 3 mol -1 at room conditions. Note: STP refers to standard temperature of 0°C and pressure of 1 atmosphere Solve for volume in the ideal gas law equation given pressure, Math Geometry Physics Force Fluid Mechanics Finance Loan Calculator. Ideal Gas Law Equations Calculator Science Physics Chemistry Formulas. Universal Gas Constant: Solving for volume. Inputs: moles (n) temperature (T) pressure (P).

Molar volume, or volume of one mole of gas, depends on pressure and temperature, and is 22.4 liters - at 0 °C (273.15 K) and 1 atm (101325 Pa), or STP (Standard Temperature and Pressure), for every gas which behaves similarly to an ideal gas.The ideal gas molar volume increases to 24.0 liters as the temperature increases to 20 °C (at 1 atm). For an ideal gas, the attractive or repulsive. You can measure the volume of a gas with a balloon and some quick math. First, inflate a balloon with the gas you want to measure, and tie it off. Then, you'll need to measure the balloon's radius. To work this out, sandwich your balloon between 2 flat objects, measure the distance between them with a ruler or measuring tape, and divide it. This tool can calculate any from volume, pressure or temperature gas changes by considering the combined gas law which states that the ratio between the product of the pressure & volume and the temperature of a gas based system remains constant. Combined gas law formula: PV/T = k. Where: k = constant. P = pressure. V = Volume. T = temperatur Calculate the density of the gas. Though the volume and moles of gas are fixed in these calculations, the molar mass is different for every gas. That means that the density will be different for each gas as well. To find a given gas density, divide the molar mass of the gas by the molar volume (22.4 L / mol in this case) Then, a calculated parameter should be checked against data from comparable plants in the region or from pertinent literature. Sizing the Gasholder . The size of the gasholder, i.e. the gasholder volume Vg, depends on the relative rates of gas generation and gas consumption. The gasholder must be designed to

Calculator Use. The Ideal Gas Law Calculator finds the unknown variable in the equation PV = nRT when three of the variables are known. Ideal Gas Law Formula. The ideal gas law formula states that pressure multiplied by volume is equal to moles times the universal gas constant times temperature Density calculations allow us to evaluate the behaviors of gases of unknown volume. We can determine the density of an ideal gas using knowledge of three properties of the evaluated ideal gas. This reformulation of the Ideal Gas Equation relates pressure, density, and temperature of an ideal gas independent of the volume or quantity of gas. Key.

### Ideal Gas Law Equations Formulas Calculator Volum

• Transcribed image text: Part 1) Calculate the volume of the gas at point B. VB= m Part 2) Calculate the work done on the gas as it goes from A → B. WA kJ A+B= Part 3) Calculate the work done on the gas as it goes from B → C. WB-C = KJ Part 4) How much heat is added to the gas as it goes from B → C. QB-C = KJ Part 5) How much heat is added as the gas goes from C → D
• Worked example: Using the ideal gas law to calculate a change in volume. AP.Chem: SAP‑7 (EU) , SAP‑7.A (LO) , SAP‑7.A.1 (EK) The ideal gas law can be used to describe a change in state for an ideal gas. In this video, we'll apply the ideal gas law to the initial and final states of a gas to see how changes in temperature and pressure.
• A student is investigating how the pressure exerted by a gas varied with the volume of the gas. The initial pressure was 1.6x10^5 Pa, with the volume being 9.0cm^3. Calculate the volume of the gas when the pressure was 1.8x10^5 Pa. pxV=constant (1.6x10^5) x (9.0) = (1.44 x 10^6
• e how long the burner can run 1 gallon of propane. For example, if the burner's Btu per-hour rating is 25,000: 91,500 divided by 25,000 = 3.66
• On this figure we show a gas confined in a blue jar in two different states. On the left, in State 1, the gas is at a higher pressure and occupies a smaller volume than in State 2, at the right. We can represent the state of the gas on a graph of pressure versus volume, which is called a p-V diagram as shown at the right. To change the state of.

### Volume and pressure in gases - the gas laws - Temperature

Ideal Gas Law Calculator. The Ideal gas law describes the behavior of a hypothetical real or ideal gas under various conditions. Emile Clapeyron proposed it in 1834. Ideal gas law states that for a given amount of gas, when the volume of the gas is compressed, the temperature of the gas increases. Similarly, when the volume of the gas. The volume occupied by 2.2 grams of the gas at S T P is: View solution If the concentration of C O 2 is 0 . 1 M in a soda water bottle containing 200 ml Liquid , then the volume of the dissolved C O 2 at NTP i 3.7 Calculate the velocity of a nitrogen molecule at 100 °C. (to convert from centigrade to kelvin, add 273). Mean Free Path: The distance a gas molecule can travel (on the average) is a function of total pressure and the diameter of the gas molecules. 2 1 [] 2 Lcm PNd = L=mean free path [cm] N=number density of particles [cm-3] d=molecular. Volume of Pipe Formula. The pipe volume formula is: Volume = pi x radius² x length. To do piping size calculation, follow these steps: Find the inner diameter and length of the pipe, in inches or millimeters. Calculate the inner diameter of the pipe by measuring the distance from one inside edge, across the center, and to the opposite inside edge

To fi nd out what volume of nitrogen gas in an air bag is safe for a child, go to the web site above. Go to Science Resources, then to Chemistry 11 to fi nd out where to go next. Use the volume you fi nd to calculate the mass of NaN 3(s) that is needed to produce this volume at 22.0 ˚ C and 105 kPa. LINK We The molar volume of an ideal gas is therefore 22.4 dm 3 at stp. And, of course, you could redo this calculation to find the volume of 1 mole of an ideal gas at room temperature and pressure - or any other temperature and pressure. Finding the relative formula mass of a gas from its density. This is about as tricky as it gets using the ideal gas. 3. Use the graph to find the volume of carbon dioxide that would be made from 0.25 g of calcium carbonate. 4. In this reaction, one mole of calcium carbonate makes one mole of carbon dioxide. Calculate the number of moles of calcium carbonate in 0.25 g and hence calculate the volume of one mole of carbon dioxide gas in dm3. Learning tip

### Ideal Gas Law Calculator - Calculate pressure, volume

1. The calculation uses the ideal gas equation: The ideal gas equation is a good approximation for many common gases. And, for a given temperature and pressure, the molar volume is the same for all ideal gases, and is known to the same precision as the gas constant: R = 0.082 057 338(47) L atm K−1 mol−1, that is a relative standard uncertainty of 5.7×10−7, according to the 2014 CODATA.
2. Gas volumes from moles and grams. Example: Calculate the volume of carbon dioxide gas, CO 2, occupied by (a) 5 moles and (b) 0.5 moles of the gas occupied at STP.. Solution: a) Volume of CO 2 = number of moles of CO 2 × 22.4 L = 5 × 22.
3. e the liquid volume a gas will become after being proceed, separated or generated. This is important.
4. e the molar volume of a gas by conducting a chemical reaction that produces a gas, as shown in the reaction equation below. You will react a known mass of solid magnesium with an excess of hydrochloric acid, in a sealed vessel, and use the pressure change to calculate molar volume at STP
5. VSWR Calculator. The Gas Density and Specific Volume Calculator calculates the density and specific volume of gas based on a modified version of the Ideal Gas Law: where: P is the absolute pressure of the gas, V is the volume of the gas, n is the number of moles of gas, T is the absolute temperature of the gas, R is the universal gas constant
6. e the number of moles of the gas produced. The mathematical form of the combined gas law is given below: 1 € PV 1 T 1 = P 2 V T 2 Equation 6 In Equation 6, assume that the values of pressure, volume. We represent the fact that the heat is exchanged at constant volume by writing. (3.6.2) d Q = C V n d T, where C V is the molar heat capacity at constant volume of the gas. In addition, since d E i n t = d Q for this particular process, (3.6.3) d E i n t = C V n d T. We obtained this equation assuming the volume of the gas was fixed Worked example: Using the ideal gas law to calculate number of moles. AP.Chem: SAP‑7 (EU) , SAP‑7.A (LO) , SAP‑7.A.1 (EK) The ideal gas law relates four macroscopic properties of ideal gases (pressure, volume, number of moles, and temperature). If we know the values of three of these properties, we can use the ideal gas law to solve for.

### How do you calculate molar volume of a gas at STP? Socrati

Ideal Gas Law Example: Substitute the values in the below volume equation: Volume (V) = nRT / P = (0.250 x 8.314 x 300) / 200 = 623.55 / 200 Volume (V) = 3.12 L This example will guide you to calculate the volume manually. Case 2: Find the temperature from the 250ml cylinder contaning 0.50 moles gas at 153kpa.V = 250ml -> 250 / 1000 = 0.250 L. 2.1.3 define molar gas volume and calculate reacting gas volumes from chemical equations; Scotland. Higher. SQA Chemistry. 3. Chemistry in society (a) Getting the most from reactants. The molar volume (litres mol-1) is the volume occupied by one mole of any gas at a certain temperature and pressure

### Volume of Compressed Gas in a Cylinder Air Liquide US

R is the gas constant. The value depends on the units used. When pressure is reported in atmospheres (atm), volume in liters (L), and temperature in Kelvin (K), the gas constant has a value of: You will use the ideal gas law today to find the molar mass of butane Small deviations from the ideal-gas law are observed because real-gas molecules are finite in size and exhibit mutual attractive forces. The term subtracted takes into account these two causes for deviation. A sample of pure gas at 20ºC and 670 mm Hg occupied a volume of 562 cm 3. How many moles of gas does this represent Calculate the volume of a sample of an ideal gas that contains 3.72 mol at 655 mmHg and 0 o C Octane's Tank Volume Calculator makes it really easy to work out the volume of your storage tank. All you need to do is follow the 4 steps below: 1. Click one of the 3 tabs across the top which represents your tank 2. Select your measurement units 3. Enter your tank's length, width etc 4. Click Calculate

One modified form of the Ideal Gas equation is to involve the molecular weight (MW) and the mass (m) instead of volume (V) and moles (n). The mathematical form of the Ideal Gas Law is: R - ideal gas constant. If the units of P, V, n and T are atm, L, mol and K, respectively, the value of R is 0.0821 L x atm / K x mol or 8.314 J / K x mol The tank size calculator on this page is designed for measuring the capacity of a variety of fuel tanks. Alternatively, you can use this tank volume calculator as a water volume calculator if you need to calculate some specific water volume. The functionality of this calculator will meet the needs of any people At STP, an ideal gas has a volume of about 22.4 L—this is referred to as the standard molar volume . Figure 10. Since the number of moles in a given volume of gas varies with pressure and temperature changes, chemists use standard temperature and pressure (273.15 K and 1 atm or 101.325 kPa) to report properties of gases Polyester (mylar) has a density of 1390 kg/m³. Total mass should thus be: mass = volume * density. = area * thickness * density. = 25214 * 0.0015 * 1390. ≈ 52 571.2. So if we subtract this from the lift capacity after subtracting the hydrogen mass we get: 233 500 kg - 52 571 kg = 180 929 kg Calculate the volume of one mole of a gas at 1.00 atm pressure and 0 °C. Calculate the volume of one mole of a gas at 1.00 atm pressure and 0 °C. Categories. Chemistry

To calculate, for example. 1- Calculate the volume of cylindrical reactor =. Where r=3mm, h=0.5 cm. V= (0.5) = 0.1413 cm3. By substituting in this low. Gas Hour Space Velocity= volumetric flow. The gas/oil ratio (GOR) is the ratio of the volume of gas (scf) that comes out of solution to the volume of oil — at standard conditions. . A point to check is whether the volume of oil is measured before or after the gas comes out of solution, since the remaining oil volume will decrease when the gas comes out For gas in a tank, you can determine the pressure by using the ideal gas law PV = nRT for pressure P in atmospheres (atm), volume V in m 3, number of moles n , gas constant R 8.314 J/(molK), and temperature T in Kelvin. This formula accounts for the dispersed particles in a gas that depend upon the quantities of pressure, volume, and temperature Once a void marker peak is injected, you can use the following formula to determine column void volume: Retention time of void peak (V o) * Flow Rate. Example: If an acetone peak retains at 2.32 min, and the flow rate is 0.85 mL/min, then: V o = 2.32 min * 0.85 mL/min. V o = 1.972 mL

### Molar Volume of Gas Calculations Chemistry Tutoria

The molar volume of a substance i is defined as its molar mass divided by its density ρ i 0: , =. For an ideal mixture containing N components, the molar volume of the mixture is the weighted sum of the molar volumes of its individual components. For a real mixture the molar volume cannot be calculated without knowing the density: = =. There are many liquid-liquid mixtures, for instance. Correlations for fuel oils density and temperature are calculated by use of tools based on ASTM D 1250-04 and IP 200/04 (API Manual of Petroleum Measurement Standards, Chapter 11- physical properties Data, Section 1:Temperature and pressure volume correction factors for generalised crude oils, refined products and lubricating oils).. Examples of the use of the figures are given below the figures With our gas tube trailer calculator you can easily convert your measurements into metric and determine volume equivalents using our resource tables. Stored and transported gases include, air, argon, carbon monoxide, helium, hydrogen, natural gas, neon, nitrogen and oxygen. Rawhide Leasing owns and maintains more than 60 high pressure tube. Gas stoichiometry is dealing with gaseous substances where we have given volume data or we are asked to determine the volume of some component in a chemical reaction. There are three types of Gas Stoichiometry problems: Mole-Volume (or Volume-Mole) Mass-volume (or volume-mass) Volume-Volume. You are given the moles of one component and needed.

### Video: How to Measure Gas - wikiHo

Calculate the number of hydrogen molecules contained in 6 dm 3 of hydrogen gas at room conditions. [Molar volume: 24 dm 3 mol-1 at room conditions Avogadro constant, N A: 6.02 x 10 23 mol-1] (Ans: 1.505x10 23 molecules) 7. Find the volume of nitrogen in cm 3 at STP that consists of 2.408 x 10 23 nitrogen molecules. [Molar volume: 22.4 dm 3 mol. Example 4.1 Volume of an Ideal Gas. Calculate the volume a one-pound mole (1.00 lb m mol) of an ideal gas occupies at the standard condition of 32°F and 1.00 atmosphere of pressure. Solution. The information given in the statement of the problem simplifies this problem. We do not need to convert the gas's mass to moles Combining metric and imperial measures is not typical but it can be easily calculated. LPG Liquid to Gas Volume Expansion Gas Unit Conversion. LPG expands about 270 times in volume when it goes from liquid to gas. So, 1L of liquid LPG equals 270L of gaseous LPG. As there are 1000L in a cubic metre (m³), 1 L of liquid LPG expands to 0.27 m³ water vapor in the lab. Then, calculate the pressure of dry gas (butane) collected. 2. Use the ideal gas law to determine the number of moles of butane collected. Keep in mind that the units for pressure, volume and temperature need to match the units used for the universal gas constant, R, when performing this calculation. 3 R is an ideal gas constant (for your specific gas), it will not change. What you might use is Boyle's law: P 1 V 1 =P 2 V 2. Assuming the tank is initially at atmospheric pressure and your chamber's volume remains constant, I calculated (using Boyle's law) that you need to add 0.204 mL of your air to pressurize it to 1 psi gage ### How to Calculate Density of a Gas - ThoughtC

The volume of gas at NTP produced by 100 g of C aC 2 with water is :C aC 2 +H 2 O → C a(OH)2 +C 2 H 2 . The volume of gas at NTP produced by. 1. 0. 0 To calculate %LEL to ppm example Methane 100%LEL = 5%VOL = 50,000 ppm To calculate 50% LEL divide ppm of 100%VOL(50000 ppm) by 2 or multiply by .50 To calculate 10% LEL divide ppm by 10 or multiply by .1 This law is commonly used to calculate how the volume of a gas will change if temperature, pressure or amount of gas is changed. In the Ideal Gas Law, the behaviour of a gas can be summarized using the following equation: PV = nRT. Where: P is pressure; V is volume; n is the number of gas molecules in mole This gas/oil ratio calculator can be used for determining the amount of oil needed for any gas/oil ratio required by the manufacturer's instructions for two-stroke engines. How to use: Input the required gas/oil ratio. Input the quantity of gasoline in US gallons, UK gallons or liters. Click the Calculate button to find the quantity of oil. This makes physical sense because there is an assumption in ideal gas behavior that there is no interaction between the molecules when we write Start with a reversible process for an ideal gas: (11-1) Consider two processes: one occurring at constant volume, the other occurring at constant pressure. Figure 11-1:. B oi = formation volume factor for oil at initial conditions (reservoir bbl barrels / STB stock tank barrels) from lab data; a quick estimate is , where N is the number of hundreds of ft 3 of gas produced per bbl barrels of oil [for example, in a well with a GOR gas-oil ratio of 1000, B oi = 1.05 + (10 × 0.05) Since the amount of fuel is relatively small (ratio 1:14.7), compared with the amount of air, we can neglect the fuel mass for volumetric efficiency calculation. The actual intake air volume can be calculated function of air mass m a [kg] and air density ρ a [kg/m 3]: \[V_a = \frac{m_a}{\rho_a} \tag{4}\ Calculating Volumes Delivered into Storage from Citygate Receipt Point Volumes If you know the volume of gas at a Citygate receipt point, use the following equation to determine how much gas you will deliver into storage after applying in-kind shrinkage: delivered volume = receipt point volume * (1-Z The procedure to use the molar mass of a gas calculator is as follows: Step 1: Enter the volume, mass of a gas, temperature and pressure of a gas in the respective input fields. Step 2: Now click the button Calculate Molar Mass to get the output. Step 3: Finally, the value of molar mass of a gas will be displayed in the output field The volume that one mole of an ideal gas occupies when held at a specific temperature and pressure is referred to as a molar volume. For example, at one atmosphere, the molar volume of any ideal gas is 22.414 L/mol at 0 °C and 24.137 L/mol at 21°C. Most gases follow the Ideal Gas Law closely at atmospheric pressure and room temperature    volume as indicated on a meter to the 'true' volume.1 It is a number obtained by dividing the actual volume of liquid passed through a meter during proving by the volume registered by that meter.2 The other term of the % % ( equation is the factor to correct the volume or density for the temperature and pressure o Question: Calculate the volume of the gas when the pressure of the gas is 1.30 atm at a temperature of 298 K. There are 190 mol of gas in the container. The value for the universal gas constant Ris 0.08206 L.atm/(mol. K) That rating implies that the volume at a given rating of pressure is correct. This is applicable for ANY type of pressurized tank with gas contents. Enter the ratings for the tank for volume and pressure; enter the current pressure in the tank. Then click on Calculate. The gas volume is returned in cubic feet