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Weight of opened cold coke

  1. Oct 24, 2011 #1
    A bottle of coke was taken out of refrigerator. It was then kept in a sensitive weighing balance.Its cap was opened. The initial weight was found to be 2.403 kg. After a while its weight increased to 2.423 kg. Then again it started decreasing.
    I repeated this experiment for many times. And the result was the same the weight first increased and then started decreasing.
    But I think that the weight must plainly start to decrease because the coke molecules will evaporate.
    Please explain this fairly contradictory result to me.
  2. jcsd
  3. Oct 24, 2011 #2
    It sounds like the cold Bottle attracted condensation, as the bottle warmed the condensate evaporated.
  4. Oct 24, 2011 #3


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    Interesting... I may believe it is a water condensating on the bottle.

    To check this hypothesis - try the same experiment, but do not open the bottle.

    And as soon as it reaches maximum weight - wipe it with a towel and put back on the balance.

    I hardly may believe that different bottles of Coke have their weight identical up to 1g accuracy.
    Last edited: Oct 24, 2011
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