The units used for heat capacity are typically Joules per kilogram per Kelvin (J/kg·K) or calories per gram per degree Celsius (cal/g·°C). In the provided reference, heat capacities are expressed in both calories per gram (cal/g) and Joules per kilogram (J/kg), which are equivalent units used to quantify the amount of energy required to change the temperature of a substance by a certain amount.
Summary of the Answer: The units used for heat capacity are Joules per kilogram per Kelvin (J/kg·K) and calories per gram per degree Celsius (cal/g·°C).
Detailed Explanation:
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Joules per Kilogram per Kelvin (J/kg·K): This unit is derived from the SI system and is commonly used in scientific contexts. It represents the amount of heat required to raise the temperature of one kilogram of a substance by one Kelvin. The Joule (J) is the SI unit of energy, and Kelvin (K) is the unit of temperature.
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Calories per Gram per Degree Celsius (cal/g·°C): This unit is more traditional and is often used in chemistry and biology. It indicates the amount of heat needed to raise the temperature of one gram of a substance by one degree Celsius. The calorie (cal) is a non-SI unit of energy, and Celsius (°C) is a common unit of temperature.
In the reference provided, specific heat values are given for various phase changes (melting, evaporation, sublimation, freezing, condensation, deposition) using both cal/g and J/kg. For example, the heat of melting is given as -79.7 cal/g and -330,000 J/kg. These values are equivalent, demonstrating the conversion between the two units:
- 1 cal/g = 4.184 J/kg (since 1 cal = 4.184 J).
Thus, the reference uses both units to express heat capacity, reflecting the common practice in scientific literature to provide information in multiple units to accommodate different measurement systems and preferences.
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