Quote:
Originally Posted by Shane
not to be argumentative homi, but that is incorrect. take a peep at the spec tag on the air compressor in your work shop. notice how the higher the pressure the lower the CFM rating is.
Boyle's law states that when pressure on a sample gas (ambient air in this case) increases the volume decreases proportionately if the temperature remains constant and visa- versa.
P.S. I'm curious about the no shock thing as well. |
I think he was refering to mass air flow, not cfm.
According to wiki:
"The term cubic feet per minute (CFM) is ambiguous when it comes to the mass of gas that passes through a certain point because gas is compressible. If the pressure is doubled, then, for an ideal gas, the mass of the gas that passes by will also be double for the same rate of flow in cubic feet per minute".
So even though CFM goes down, the mass of the air goes up. So in reality, more air is being passed.
Also, I dont think the compressor analogy would apply here. A compressor is fighting to fill a tank that is at a psi slightly lower than the output. It has to build up.
Air flows to the path of least resistance, and evens out. A bag at zero psi will react more, than a bag at 150 psi.
Also, a tank at 200 psi, filling a pair of bags will go down to lets say 150. bags and tank will be at the same pressure. Dump, and fill the bags. Second time around got a bit slower, and the bags may have only gone to 100. 3 time around, you'll notice that it barely moves. Therefore, the less pressure, the slower the rate of air flow.
I think we all know what we are talking about, just not the proper terms to put it in so we all understand. I think I'm on the right path in my thinking.