Why does the weight of opened cold coke change over time?

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SUMMARY

The weight of an opened cold Coke bottle initially increases due to condensation forming on its surface, resulting in an increase from 2.403 kg to 2.423 kg. This phenomenon occurs as the cold bottle attracts moisture from the air, which then evaporates as the bottle warms. Repeated experiments confirm this pattern, where the weight first rises and then decreases as evaporation occurs. To further investigate, it is suggested to conduct the same experiment without opening the bottle to observe the weight changes without the influence of evaporation.

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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.
 
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It sounds like the cold Bottle attracted condensation, as the bottle warmed the condensate evaporated.
 
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.

EDIT>>>
I hardly may believe that different bottles of Coke have their weight identical up to 1g accuracy.
 
Last edited:

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