If the Earth’s atmosphere warmed up and expanded to a larger total volume but

[toni.chang]

its total mass did not change...? If the Earth’s atmosphere warmed up and expanded to a larger total volume but its total mass did not change, would this affect the atmospheric pressure at sea level? Would this affect the pressure at the top of Mount Everest? Explain.

[Jack]

Yes. The pressure at sea level would change. And yes, the pressure at the top of Mount Everest would change.

Atmospheric pressure at sea level is calculated using the total volume of air above the point of measurement. So from sea level to outer space it would be exponential. For example...1 psi at sea level and .5 psi at the top of Mount Everest. Now, if the atmosphere above Mount Everest expanded by 1 psi then sea level would be 2 psi now. And Mount Everest would be 1.5 psi.

This is based on the assumption that all layers of the atmosphere expanded. You do know there are layers to the atmosphere right?