Insulated coffee cup mystery...

Discussion in 'Physics' started by cmartinez, Apr 10, 2018.

  1. cmartinez

    Thread Starter AAC Fanatic!

    Jan 17, 2007
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    Now my head is spinning a bit... what you say does sound as true... but it makes me wonder, how much of a difference would the presence of a tiny hole in the lid make regarding heat preservation?
     
  2. joeyd999

    AAC Fanatic!

    Jun 6, 2011
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    There will be some convection in the vicinity of the hole. Hot, humid air will rise out, cool dry air will fall in. The rate, though, will be *much* slower than an open container.

    More importantly, I think, is the heat released to the lid (and then convected away from the other side of the lid) due to condensation of water vapor under the lid.
     
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  3. Hymie

    Member

    Mar 30, 2018
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    I recall a colleague of mine buying one of these things and telling me that it keeps hot things hot, and cold things cold.

    I then asked him what he had in it.

    He replied two cups of coffee and a choc-ice.
     
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