Speed of Sound at High Pressures - Now Includes Helium

[rsterne]

After many hours of scouring the Internet, I finally found a paper that had the Speed of Sound in Helium at high pressures and room temperature.... I have added the data to my previous graph, as follows....



Note that the velocity scale for Helium is on the right axis to prevent it from compressing the vertical scale to the point of being hard to read.... The velocity for Air and Nitrogen continue to be on the left axis.... On a percentage basis, the speed of sound for Helium changes about 1/3rd as much as it does for air.... and it does so in a nearly linear fashion.... Both increase about 500 fps between atmospheric pressure and 5000 psi.... but Air and Nitrogen are not linear....

Bob