Final answer:
The amount of energy required to raise the temperature of 1 liter of water by 1 degree Celsius is known as a calorie (cal). It is commonly used when referring to the amount of energy contained within food.
Step-by-step explanation:
The amount of energy, in the form of heat, required to raise the temperature of 1 liter of water by 1 degree Celsius is known as a calorie (cal).
A calorie is the quantity of heat required to raise the temperature of 1 gram of water by 1°C. It is commonly used when referring to the amount of energy contained within food. For example, if you raise the temperature of 100 g of water from 20°C to 22°C, it would require 200 calories.
Other units of heat include the joule (J), which is the SI unit of energy, and the BTU, which is the energy required to heat one pound of water by one degree Fahrenheit.