Why does ethanol feel colder on our skin compared to water?

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SUMMARY

Ethanol feels colder on the skin compared to water due to its higher evaporation rate. The discussion highlights that more energy is required to convert liquid ethanol to gaseous ethanol than for water, but the key factor is that ethanol evaporates faster, leading to a greater cooling effect on the skin. This phenomenon is attributed to the differences in the molecular structure and intermolecular forces between ethanol and water.

PREREQUISITES
  • Understanding of basic thermodynamics
  • Knowledge of molecular structure and intermolecular forces
  • Familiarity with the concepts of evaporation and heat transfer
  • Basic chemistry principles regarding liquids and gases
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  • Research the molecular structure of ethanol and its impact on evaporation rates
  • Study the principles of heat transfer in liquids
  • Explore the thermodynamic properties of ethanol compared to water
  • Investigate applications of ethanol in cooling technologies
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This discussion is beneficial for chemists, physicists, and anyone interested in the principles of thermodynamics and heat transfer, particularly in the context of evaporation and cooling effects of different liquids.

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When we have ethanol on our skin it feels colder than when we have water on our skin. The explanation given was that more energy is required to turn one molecule of liquid ethanol to gaseous ethanol than for one molecule of liquid water. However, in that case won't more of the water evaporate too? So why would ethanol feel colder?
 
Science news on Phys.org
Ethanol evaporates faster.
 

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