Opening a bottle of soda or champagne

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SUMMARY

When opening a bottle of soda or champagne, a white cloud forms due to the sudden expansion of bubbles, which leads to adiabatic cooling. This phenomenon is explained by thermodynamics, where the equalization of pressures increases entropy, allowing for a greater distribution of molecules. The cloud may not be visible on warm, dry days due to lower humidity levels. This explanation confirms the initial hypothesis regarding the cloud formation.

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  • Understanding of thermodynamics principles
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  • Knowledge of entropy and molecular distribution
  • Basic concepts of gas behavior under pressure
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  • Explore the relationship between pressure changes and entropy
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When we open a bottle of soda or champagne, a white cloud raises briefly. Based on thermodynamics, why does it happen?
 
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The sudden expansion of the bubbles causes adiabatic cooling. (This is allowed thermodynamically because an equalisation of pressures produces more possibilities for how the molecules are distributed, so entropy increases.) It can be enough to cause some water vapour to condense briefly. You might not observe the cloud on a warm dry day.
 
Thanks a lot, I thought the same, but couldn't find a confirmation and you provide me with that one!
 

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