Standard altitude-pressure tables allow mountaineers and aviators ... As air becomes less dense, it contains less gases per unit of volume, and therefore less oxygen. Physiologists use this ...

text{pressure} = \frac{\text{force}}{\text{area}}\) The unit of force is a Newton (N). The unit of area is a square metre (m 2). The unit of pressure is a Pascal (Pa).

As air rises it cools and clouds form. In everyday life, the pascal is a unit of pressure and best known from meteorological barometric pressure reports, where it occurs in the form of ...