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Beauty & Health>General Health

Why air from hot water bottle is expelled after filling?

Anonymous

∙ 12y ago

Updated: 4/28/2022

Because the heat from the water could in theory build up enough air pressure to cause the bottle to burst - covering the person with scalding water. Expelling all the air from the bottle before tightening the stopper reduces the risk dramatically.

Wiki User

∙ 12y ago

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