<Li> The stresses in an electromagnetic field are generally non-isotropic, with the pressure normal to one surface element (the normal stress) being negative, and positive for surface elements perpendicular to this . </Li> <Li> In the cosmological constant . </Li> <P> Stagnation pressure is the pressure a fluid exerts when it is forced to stop moving . Consequently, although a fluid moving at higher speed will have a lower static pressure, it may have a higher stagnation pressure when forced to a standstill . Static pressure and stagnation pressure are related by: </P> <Dl> <Dd> p 0 = 1 2 ρ v 2 + p (\ displaystyle p_ (0) = (\ frac (1) (2)) \ rho v ^ (2) + p) </Dd> </Dl>

Air pressure can be expressed in which of the following units