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

The use of evaporative cooling by mammals relies on the principle that

A. Sweat releases heat to the body as it evaporates
B. The water in sweat has a high heat of vaporization, absorbing body heat to evaporate
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C. The water in sweat has a high specific heat, which cools the skin
D. Evaporation prevents the cohesion of water molecules on the skin

📝 Explanation

The high heat of vaporization (latent heat) means a large amount of thermal energy is required to convert liquid sweat to vapor. This energy is absorbed from the skin, lowering its temperature. This is a highly effective cooling mechanism.

📖 Additional Information

  • Sweat releases heat to the body as it evaporates
  • The water in sweat has a high heat of vaporization, absorbing body heat to evaporate
  • The water in sweat has a high specific heat, which cools the skin
  • Evaporation prevents the cohesion of water molecules on the skin

The high heat of vaporization (latent heat) means a large amount of thermal energy is required to convert liquid sweat to vapor. This energy is absorbed from the skin, lowering its temperature. This is a highly effective cooling mechanism.

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