What is heat energy ? What is the formula and unit of heat energy
Answers
Answer:
Units of Heat. The SI unit for heat is a form of energy called the joule (J). Heat is frequently also measured in the calorie (cal), which is defined as "the amount of heat required to raise the temperature of one gram of water from 14.5 degrees Celsius to 15.5 degrees Celsius.
Heat energy is the result of the movement of tiny particles called atoms, molecules or ions in solids, liquids and gases. Heat energy can be transferred from one object to another. The transfer or flow due to the difference in temperature between the two objects is called heat.
To calculate the energy required to raise the temperature of a known mass of a substance, you use the equation E = m × c × θ, where E is the energy transferred in joules, m is the mass of the substances in kg, c is the specific heat capacity in J/kg degrees C and θ is the temperature change in degrees C. For example, to work out how much energy must be transferred to raise the temperature of 3 kg of water from 40 degrees C to 30 degrees C, the calculation is E = 3 × 4181 × (40 - 30), which gives the answer 125,430 J (125.43 kJ).
As a form of energy, heat has the unit joule (J) in the International System of Units (SI). The standard unit for the rate of heat transferred is the watt (W), defined as one joule per second.