Recent content by darrelu

Thank you. I appreciate your effort very much. It helps a lot to just have had you work through this with me. Like you, I have also been wondering how big a role heat transfer plays in this problem. There is also a difference between air and nitrogen and I am pretty sure that is do to...

I think you are missing my point. If we assume the resistance of the syststem is the same for air and He, and we fix the pressure for both, then dm/dt for He will always be about seven times less than for air. When you multiply each by the specific gas constant for that gas, it compensates for...

Maybe I am being dense here, but isn't this the very same issue I asked about earlier? The product of R and dm/dt is approximately a constant in all cases - lower weight is compensated for by a higher value for the specific gas constant. That is why the R values you quote are different by...

I have been thinking more about your reply. It seems to me that the issue is that dm/dt is not equal when we run a pneumativ motor at a constant pressure. In fact, if we consider the gases to be ideal doesn't dm/dt and 1/rho exactly compensate for each other?

Thank you very much

I have observed that a pneumatic motor runs much faster on helium than air at the same tmeperature. Why is this? Is the power output the same for both gasses or is power just proportional to speed?