Reference Guide

Equation Reference 5-25
Gases (5)
Variable
Description
λ
Mean free path
ρ
Flow density
ρ 0
Stagnation density
A
Flow area
At
Throat area
d
Molecular diameter
k
Specific heat ratio
M
Mach number
m
Mass
MW
Molecular weight
n
Number of moles, or
Polytropic constant (Polytropic Processes)
P
Pressure, or Flow pressure (Isentropic Flow)
P0
Stagnation pressure
Pc
Pseudocritical pressure
Pi, Pf
Initial and final pressures
T
Temperature, or Flow temperature (Isentropic Flow)
T0
Stagnation temperature
Tc
Pseudocritical temperature
Ti, Tf
Initial and final temperature
V
Volume
Vi, Vf
Initial and final volumes
vrms
Root-mean-square (rms) velocity
W
Work
References:1, 3.
Ideal Gas Law (5, 1)
Equations:
P V⋅ n R T⋅ ⋅=
m n MW⋅=