Is there a direct relationship between temperature and air pressure in an....?

unconfined area with an indefinite volume of air? In other words, if temperature changes, will air pressure always change as a result? If I go outside today when it's 40 degrees, will the air pressure be the same if I go outside tomorrow when it's 40 degrees?

I'm sorry if this is in the wrong section. The weather section was no help.
 
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