Warm water bottled water after the cap often supposed to jump
This is mainly because the temperature difference between the bottle cap and the water bottle is too great. Before using the thermos bottle, scald the bottle cap with boiling water. That's how it's played at college.
In the part of hot water poured out, there will be a corresponding volume of cold air into the bottle, the cork out of the same possible phenomenon, can be poured hot water after a period of time, open the bottle, let the gas heated discharge after the stopper expansion, but this method is only applicable to often use warm bottles, or long time no, can't pull out the cork, remember.
The reason is not a thermos bottle filled with hot water, there will be a part of the air, this air expands when heated, a certain pressure generated in the bottle, when the friction force is greater than the cork and the bottle, the cork out of it.
