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
Open the straw when you screw the lid on too. It allows the coffee to fill the straw so that the next time you open it, it won’t have the additional pressure difference of the liquid’s height.
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