In the context of aircraft design, the density of an auxiliary system typically refers to the density of a fluid (such as air or fuel) within that system. The formula for density (ρ) can be defined as:
- 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)