The density (ρ) of air in a ramjet engine can be calculated using the ideal gas law. The ideal gas law relates the density, pressure, temperature, and gas constant (R). The formula is as follows:
- ρ = Density of the fluid (in kilograms per cubic meter, kg/m³)
- P = Pressure of the fluid (in pascals, Pa)
- R = Specific gas constant for the fluid (in J/(kg·K))
- T = Temperature of the fluid (in kelvin, K)