Hot metal lid on cool surface has resistance when pulled up

  • #1
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I placed a hot metal lid on a cool surface. When i tried to pull it up, it had a lot of resistance, i had to really try to pull it up. I could hear sounds under the lid, i'm guessing it was boiling water.

What do you think could have caused this resistance?

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  • #2
sophiecentaur
Science Advisor
Gold Member
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Hot lid from saucepan with water on the underside and hot air underneath. Lid put on cool surface. Air inside cools and pressure drops. Water forms a seal round the outside.
Nature abhors a vacuum. (There is a more Scientific version of the final step :biggrin:)
It happens with hot coffee mugs on laminated table top and can make you splash coffee all over the table when you try to lift it to drink. Whoop whoop safety hazard.
 

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