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How elevation and air pressure affects the boiling point

Briefly state how does the elevation and air pressure affects the boiling point of water?

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The mere factor which recognizes the boiling point of water at any altitude is the barometric pressure (that is, the altitude itself does not really matter; it is just that at higher elevation, the barometric pressure generally drops). Though, water will boil at two distinct temperatures at similar elevation if you are in a high pressure weather system rather than a low pressure system.

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