Originally Posted by pwguy
Nitrogen is less sensitive to temperature change than air?
Good ole Boyle must be rolling over in his grave.
I don't know why he would be rolling over in his grave. Boyle's law states at a constant temperature for a fixed mass, the absolute pressure and volume of a gas are inversely proportional
To prove my point further that gasses tend to expand as temperatures rise please refer to Charles's law. Charles law states that if the pressure of a gas is kept constant and if you heat said gas, the volume will change. V1/T1=V2/T2
Now you dig a little deeper you will find the Emile Clapeyron combined these two laws into one called the.... wait for it.......Combined Law aka the ideal gas law. This law allows one to prove that if the volume of a gas is held constant and the temperature of said gas is increased or decreased the pressure of pressure of said gas will increase or decrease proportionately.
Now that we have proved that gases expand and contract with the rise and fall of temperatures, and that if the volume of said gas is held constant while it is being heated ( or cooled) the pressure will go up (or down) accordingly, we can now go into the fact that two gasses of different compositions will have different specific gravity. This difference in specific gravity will allow the two gasses of constant volumes and introducing the same amount of BTU's to exert different pressures.
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