The power unit 1 W equals 1 J s -1 . Pressure is measured as force per area unit that is in N m -2 or Pascal . In the gravity field of the earth G or g equals 9.807 m s -2 . Blood and sea water has a relative density of 1033 kg m -3 . The classical concept is that 1 atmosphere equals 760 mmHg.
Concentration is mass per volume unit.
Squared brackets around a substance or C denote concentration. This is a precise short-cut for intellectual transfer used by all physiologists. Small letters in a suffix denote gas dissolved in blood, whereas large letters denote gas in air. The symbol is often the first letter in the English word.