How to open the vacuum pump bottle?

Release time:2019-04-30
Abstract:

With warm water, the hot towel is hot, that is, the col […]

With warm water, the hot towel is hot, that is, the cold vacuum is sucked up, and the volume of the gas inside becomes smaller. After the heat is heated, the volume of the gas becomes larger, the negative pressure is smaller, and it is easy to unscrew.

 

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