Hot metal lid on cool surface has resistance when pulled up

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SUMMARY

The discussion centers on the phenomenon of resistance encountered when lifting a hot metal lid placed on a cool surface. The primary cause identified is the formation of a vacuum as the hot air and water beneath the lid cool, leading to a pressure drop. This creates a seal around the lid, resulting in significant resistance when attempting to lift it. Similar occurrences are noted with hot coffee mugs on cool surfaces, highlighting a common safety hazard.

PREREQUISITES
  • Understanding of thermodynamics, specifically heat transfer and pressure changes.
  • Familiarity with the concept of vacuum formation and its effects on pressure.
  • Basic knowledge of the properties of water and air under varying temperatures.
  • Awareness of safety hazards related to hot liquids and sealed containers.
NEXT STEPS
  • Research the principles of thermodynamics related to heat transfer and pressure dynamics.
  • Explore the effects of vacuum formation in various scenarios, including cooking and food storage.
  • Learn about safety measures to prevent accidents with hot liquids and sealed containers.
  • Investigate similar phenomena in everyday objects, such as suction cups and their applications.
USEFUL FOR

This discussion is beneficial for individuals interested in physics, culinary professionals, and anyone concerned with safety in handling hot liquids and understanding the science behind vacuum formation.

AMan24
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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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PSJIF
 

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Physics news on Phys.org
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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