GENERAL KNOWLEDGE

Detailed explanation-1: -Taking into account the existence of the mechanical equivalent of heat, we can measure the amount of heat transferred to a system in calories (cal) ( c a l ) or in joules (J) . In many bibliographies we can find it in any of the two units, although in SI the amount of heat is measured in joules.

Detailed explanation-2: -In the metric system, heat is measured in units of calories, which are defined as the amount of heat required to raise the temperature of one gram of water from 14.5oC to 15.5oC. In the SI system, the unit of heat is the joule.

Detailed explanation-3: -Units of Heat Heat flow is measured in one of two common units: the calorie and the joule. The joule (J) is the SI unit of energy.

Detailed explanation-4: -The unit of quantity of heat is the joule (J). Heat flow may be expressed as joules per second (J/s), but as a heat flow of one joule per second equals one watt the unit watt (W) is usually adopted for practical purposes.

Detailed explanation-5: -As a form of energy, heat has the unit joule (J) in the International System of Units (SI). In addition, many applied branches of engineering use other, traditional units, such as the British thermal unit (BTU) and the calorie. The standard unit for the rate of heating is the watt (W), defined as one joule per second.