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BIO NMDCAT Biological Importance of Water
nmdcat.online June 27, 2026

The high heat of vaporization of water is critical for thermoregulation in mammals because

A. It requires a large amount of heat to be absorbed from the environment to convert liquid to gas
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B. It releases a massive amount of heat into the body when sweat evaporates
C. It prevents any water loss from the body surface during exercise
D. It ensures that the body's internal temperature is always lower than the external air temperature

📝 Explanation

When sweat evaporates, the phase change from liquid to gas requires a large amount of heat energy (latent heat of vaporization). This heat is absorbed from the skin's surface, effectively cooling the body. The cooling is due to heat removal, not heat release.

📖 Additional Information

  • It requires a large amount of heat to be absorbed from the environment to convert liquid to gas
  • It releases a massive amount of heat into the body when sweat evaporates
  • It prevents any water loss from the body surface during exercise
  • It ensures that the body's internal temperature is always lower than the external air temperature

When sweat evaporates, the phase change from liquid to gas requires a large amount of heat energy (latent heat of vaporization). This heat is absorbed from the skin's surface, effectively cooling the body. The cooling is due to heat removal, not heat release.

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