Based on the defi nition in Problem 5.55, use the thermodynamic web to come up with an
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Based on the defi nition in Problem 5.55, use the thermodynamic web to come up with an expression for [Vsound] in air. What is the value of [Vsound] in air at 20°C? You may consider air to be an ideal gas with cP = 17/22R. Based on this result, how far away is a bolt of lightning if you hear the thunder four seconds after you see the lightning.
Problem 5.55
The speed of sound, Vsound [m/s], is formally equal to the partial derivative of pressure with respect to density at constant entropy:
Show that,
where MW is the molecular weight.
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