In ideal gases, it is the product of Boltzman's constant, the number density, and the temperature.
In static fluids, it forms the diagonal components of the stress tensor.  For black-body radiation it is one-third of the energy density.  In ideal gases, it is the product of Boltzman's constant, the number density, and the temperature. For ten points, name this physical quantity, measured in units of Pascals and pounds per square inch.
In static fluids, it forms the diagonal components of the stress tensor.  
pressure