ELIF: if air does have weight, why doesn’t weighting a thing under the roof shows lower number than doing it outside?

Question

ELIF: if air does have weight, why doesn’t weighting a thing under the roof shows lower number than doing it outside?

In: Physics

Answer 1

Air’s “weight” on another object is communicated by air pressure it exerts on it. Generally speaking, the air pressure inside a building will be nearly identical to the air pressure outside of one, because they’re not airtight. The air in a container (in this case a building) will attempt to reach equilibrium with the environment surrounding it. Because the pressure is the same, they it will press down on an object being weighed the same.