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A barometer should be outside because houses can have different pressures than the outside pressure. If you've ever seen wind blowing out of your window, especially in a large building such as an apartment complex or dormitory, that is an example. Barometers are used to predict weather patterns, so it is more useful to know the general air pressure rather than the specific air pressure of one dwelling.

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15y ago
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Q: Why should a barometer be outside?
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