Talk:Light-gas gun
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Speed of sound of hydrogen
[edit]At conditions achieved in two-stage light-gas guns, the speed of sound of hydrogen depends on both pressure and temperature. This is because the hydrogen is compressed to densities where the interaction between the fluid particles can no longer be neglected. One publication that deals with the equation of state of hydrogen at such conditions is NRL Report 6675 from 1968, available via dtic []. Fig. B3 in this report plots sound speed vs. temperature for various pressures. From this graph it is obvious that "The speed of sound also increases with the temperature of the fluid (but is independent of the pressure)" (as stated in the article) is not correct for relevant conditions. There are newer references that confirm those findings.
Since I'm no native speaker, I would like to leave an update of the article to somebody more familliar with English.
By the way, Fig. B3 in NRL Report 6675 also shows that the speed of sound increases considerably with pressure. In high performance experiments with two-stage light-gas guns, more than 10,000 atm are achieved in hydrogen. According to the figure, this would correspond to a sound speed of roughly 5.5 km/s. 153.96.89.5 (talk) 20:27, 11 December 2014 (UTC)