Isentropic Relation Pressure Total Pressure Formula

Equation for calculate isentropic relation pressure total pressure is,

P / P_t = (ρ / ρ_t)^γ

Where,
P / P_t = Isentropic Flow Relation Between Pressure and Total Pressure
P = Pressure
P_t = Total Pressure
ρ = Density
ρ_t = Total Density
γ = Specific Heat Ratio