What is the relationship between air pressure and air masses

Air mass affect the air pressure.

Explanation:

Air mass depends on the moisture of the environment it is located in as well as the temperature that is in that environment. Depending on the location's temperature from the air mass, it would end up affecting the air pressure. If the air mass is dense with a cold temperature the air pressure would rise. The same applies for warmer temperatures. When the air mass is less dense and the temperature is hot, the air pressure would fall.