# Jet

For alternative meanings, see Jet (disambiguation).

A jet is a stream of fluid produced by discharge through an orifice into free space.

Since gases are compressible fluids, the velocity attained by a jet of gas cannot be determined by Bernoulli's principle. Instead, if one uses adiabatic expansion from P1 to P2 in a properly shaped nozzle, the ideal velocity of a gas jet is:

[itex]v=8\sqrt{(RT_1/z) (1-(P_2/P_1)^z)} [itex]
R is the common gas constant
T1 is the absolute temperature at pressure P1
z is [itex]\begin{matrix}{c_p - c_v \over c_p}\end{matrix}[itex]
cp is the specific heat at constant pressure
cv is the specific heat at constant volume
z = 0.286 for air under 500 °C
z = 0.23 to 0.28 for most combustion products of fuels

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