Insulated coffee cup mystery...

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

  1. cmartinez

    Thread Starter AAC Fanatic!

    Jan 17, 2007
    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
    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.
    cmartinez likes this.
  3. Hymie


    Mar 30, 2018
    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.