Correct answer: calorie
The amount of heat required to raise the temperature of 1 gram of water by 1 °C is called a calorie. It is a unit of heat energy.
- 1 calorie = 4.184 joules. - Joule is a unit of energy, not specifically the amount of heat required to raise the temperature of water by 1°C.
- Kelvin is a unit of temperature.
- Degree Celsius is a unit of temperature change, not heat.