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

The fact that the specific heat of water is exactly 1 cal/g°C has a significant practical importance because it

A. Defines the calorie as a unit of heat energy
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B. Means water cannot be used in any calorimetry experiments
C. Sets a lower limit on the temperature of any chemical reaction
D. Prevents water from ever reaching a temperature above 100°C

📝 Explanation

Historically and by definition, one calorie is the amount of heat energy needed to raise the temperature of exactly one gram of pure water by exactly one degree Celsius. This makes water the standard reference for calorimetry and the definition of heat units.

📖 Additional Information

  • Defines the calorie as a unit of heat energy
  • Means water cannot be used in any calorimetry experiments
  • Sets a lower limit on the temperature of any chemical reaction
  • Prevents water from ever reaching a temperature above 100°C

Historically and by definition, one calorie is the amount of heat energy needed to raise the temperature of exactly one gram of pure water by exactly one degree Celsius. This makes water the standard reference for calorimetry and the definition of heat units.

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