MadSci Network: Other |
Well, the simple answer is that the barometric pressure inside is the same as it is outside. Think about what pressure differences cause... Wind. If the pressures were different, your doors would either blow open as soon as you unlatched them or they would be pushed shut as they started to get nearly closed. This doesn't generally happen. Even in windy weather, you will usually find that the blowing-open effect is limited to one side of a building, not because the barometric pressure is different. The more interesting way of dealing with this is to EXPERIMENT. Take the barometer outside and compare it with the inside reading on each of 10 days. Keep the barometer out of the sun so that it won't be heated which will expand the air in the sealed part of the mechanism. Compare the inside and outside pressures with a table or graph. David Winsemius, MD
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