Which measurement represents the amount of heat required for a 1 kg mass to change temperature by 1 K?

• A. Thermal conductivity
• B. Specific heat capacity
• C. Heat of vaporization
• D. Specific heat ratio

Answer: (B)

The measurement that represents the amount of heat required for a 1 kg mass to change temperature by 1 K is specific heat capacity. Specific heat capacity is defined as the quantity of heat needed to raise the temperature of one kilogram of a substance by one degree Kelvin (or one degree Celsius). It is a crucial concept in thermodynamics and material science, as it indicates how much energy must be added or removed to cause a temperature change in a material.

In practical terms, materials with high specific heat capacities, like water, require a larger amount of heat to change their temperature compared to materials with low specific heat capacities, like metals. This property is especially important in various applications, such as heating systems, engines, and environmental studies, where temperature control is essential.

Thermal conductivity refers to the ability of a material to conduct heat, not the amount of heat required for temperature change. The heat of vaporization deals with the energy needed to convert a substance from liquid to gas at constant temperature, while the specific heat ratio is a dimensionless quantity defined as the ratio of specific heats, relevant in thermodynamics but not directly related to temperature change per mass.