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

Like u/MorganLaBigGae pointed out, the difference is not between inside and outside (unless we’re talking about a vacuum) but between roof and ground level.
The difference is there, it is just too small for your bathroom scale to measure.

More precise instruments called barometer will show different air weight (air pressure) at different altitudes. This fact is even used to determine altitude in airplanes!