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What is the volume of air at any given pressure ie 700kPa?


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Answered 2005-09-09 19:35:28

There are many formula's for calculating the volume of air. The most basic is the ideal gas law. For this law, the answer would be V = R * T / (P * MW), where R = a constant, 10.73, T is the temperature in Rankine, which is Fahrenheit + 459.7, P is the absolute pressure in PSIA, and MW is the molecular weight, in this case use 28.5. The answer will be in cubic feet per pound of air. For example, if I had a container of air and the pressure was reading 10 pounds on the gauge, and the temperature was 70, then the formula would be as follows: PSIA = PSIG + 14.7, so PSIA = 24.7. T = 70 + 459.7, so T = 529.7. V = 10.73 * 529.7 / (24.7 * 28.5). The answer is in cubic feet per pound of air. The volume would be that of its container regardless of pressure.


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