I have two insulated travel mugs. One has a pour spout and one has a straw. They are both leak proof, so in theory, the lids of each form a tight seal. When I open the lid to drink my hot coffee from the thermos with a straw, the coffee explodes out the top. When I open the lid to drink from the thermos with the pour spout, it doesn’t. What gives?
In: Chemistry
Id wager its because of pressure. Water is hot, put into sealed container. Water evaporates and produces pressure.
You open the straw thing. The bottom of the straw is IN the water, the pressure forces the water through the straw.
You open the other one. The bottom of it is NOT in the water, so instead the hot steam can escape, without having to push any water aside.
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