In aircraft design, the term “O type piston engine” isn’t a standard classification or widely recognized nomenclature for piston engines. Density is a property of materials or substances and is typically measured in units such as kilograms per cubic meter (kg/m³) or pounds per cubic foot (lb/ft³). It represents the mass of a substance per unit volume.
- 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)