In aircraft design, the “density” of a reciprocating engine typically pertains to the air density or the density of the air-fuel mixture. The formula for this density (ρ) is calculated using the ideal gas law:
– ρ (rho) = Density of the air (or air-fuel mixture) (in kilograms per cubic meter, kg/m³)
– P = Pressure of the air (in pascals, Pa)
– R = Specific Gas Constant for dry air (in joules per kilogram-kelvin, J/(kg·K))
– T = Temperature of the air (in kelvin, K)