For an isentropic flow of a perfect gas, several relations can be derived to define the pressure, density and temperature along a streamline.
12.
The equation of state of a perfect gas is a first approximation to a quantum equation of state that results from statistical physics.
13.
A " perfect gas " is one whose molecules do not interact with each other and which have no volume of their own.
14.
The disk is designed to deflect the tenuous gases in low Earth orbit and thus create an almost perfect gas-free vacuum in its wake.
15.
Thus, the equation of state of a real gas within classical limits assumes the form of the equation of state of a perfect gas.
16.
Sometimes, a distinction is made between an ideal gas, where and could vary with temperature, and a perfect gas, for which this is not the case.
17.
The relation of these " perfect " bodies to " real " bodies may be illustrated by the relation of a perfect gas to a real one.
18.
Under a perfect gas model there is an elegant set of equations for determining thermodynamic state along a constant entropy stream line called the " isentropic chain ".
19.
That is, the equation of state of a perfect gas describes an ideal gas ( comprising points, that is, dimensionless molecules that do not act upon one another ).
20.
Even more restricted is the "'calorically perfect gas "'for which, in addition, the heat capacity is assumed to be constant : e = C _ vT and h = C _ pT.
