Which of the following defines the unit of heat known as a large calorie?

The large calorie is defined as the amount of heat required to raise the temperature of 1 kilogram of water by 1 degree Celsius. This definition is significant because it is based on a specific quantity of water, which is commonly used in calorimetry and thermodynamics to measure heat. A calorie, in this context, is a unit of energy that reflects the thermal energy needed to change the temperature of water, a common substance in many scientific experiments.

Understanding this definition allows for practical applications in both laboratory settings and real-world scenarios, where temperature changes in water are often a key factor in various physical processes. The use of a kilogram rather than a liter differentiates the large calorie from the small calorie, which pertains to just raising the temperature of 1 gram of water by 1 degree Celsius. The context surrounding the measurement reinforces its importance in studies involving heat transfer and energy calculations.