In aircraft design, a “differential pressure tester” doesn’t have a density because it’s not a substance or material; rather, it’s a device used to measure the difference in pressure between two points in a system. Density is a property of substances or materials and is typically given in kilograms per cubic meter (kg/m³) in the International System of Units (SI).
The density of air, for example, can be calculated using the ideal gas law:
– ρ is the density of the air (in kg/m³).
– P is the pressure (in pascals, Pa).
– R is the specific gas constant for dry air (around 287 J/(kg·K)).
– T is the absolute temperature (in kelvin, K).