3. Ratings and main standard values

3.1 SI and imperial units of measurement

The units most commonly used in this article are those of the International System (SI). Speed is expressed in meters per second (m/s ^-1 ), pressure in pascals (Pa), or even in bars (1 bar = 105 Pa) or MPa. The thermodynamic quantities of fluids involved in propulsion involving joules (J) or watts (W), for example specific heat capacities (c _p , c _V , and by extension r), are in J.kg ^-1 .K ^-1 . Temperatures are expressed in kelvins (K).

The main Anglo-Saxon units still used in articles and works...