Science Fair Project Encyclopedia
- κ = cp/cV
One can easily understand the relation if one thinks of the following experiment: A cylinder closed at one end with a blocked piston is filled with air. This cylinder is then heated. Since the piston cannot move the volume is constant. Temperature and pressure will rise. One stops the heating noting how much energy one has added to the system (cv) and frees the piston. The piston will move outward and by adiabatic expansion, the gas cools. To bring the temperature of the gas to its former level one has to heat it a little bit. This extra heat amounts to about 40% of cv thus:
- cp = 1.402 · cV
A value often used in aerodynamics is
- cp - cV = 0.4
Kappa can also refer to several other things, but it can usually be determined by the context which one. Sometimes the Greek letter gamma γ is used.
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details