4. Acronyms, notations and symbols

The unit of each quantity will be expressed using the international system. Basic units: length in meters (m), mass in kilograms (kg), time in seconds (s), temperature in kelvin (K), quantity of matter in moles (mol). Derived units, expressed in terms of the base units: pressure in pascal (Pa : kg · m ^–1 · s ^–2 ), energy in joules (J · kg · m ² · s ^–2 or Pa · m ³ ), power in watts (W: kg · m ² · s ^–3 or J · s ^–1 ), angle in solids in steradians (sr: m ² · m ^–2...