Blank is what is happening in the air or atmosphere at one time in one place?

A part of Thermodynamics that studies the physical laws and energy flows involved in atmospheric processes is called atmospheric dynamics or atmospheric dynamics. These processes present a great complexity due to the enormous range of possible interactions both within the same atmosphere and with other parts of our planet.

  Thermodynamics establishes three laws, in addition to what is known as the zero principle of thermodynamics. These three laws govern the physical-natural and selective world around the scientific basis of the processes that specify the field of atmosphere dynamics

Multiply the 3 dimensions, assuming it is a rectangular cuboid, to get the volume in cm³ divide mass by volume to get density in g/cm³