Heat Measurement Unit
Heat is a form of energy transfer. The standard unit for measuring energy, including heat, in the International System of Units (SI) is the joule.
- Joules (J): This is the SI unit for energy and heat. When heat is supplied to a system, the amount is quantified in joules.
- Kilowatts (kW): This is a unit of power, which is the rate at which energy is transferred or work is done (1 kW = 1000 Joules per second). It measures power, not the total amount of heat energy.
- Amperes (A): This is the SI unit for electric current, measuring the flow of electric charge. It is unrelated to heat measurement.
- Degrees Kelvin (K): This is the SI unit for thermodynamic temperature. Temperature indicates the hotness or coldness of a system, not the amount of heat energy supplied.
Therefore, heat supplied to a system is measured in joules.
Similar Questions
Find the heat capacity of a steel vessel of mass 2.5 kg if its temperature rises by 10 degrees. Specific heat capacity of steel is 500 Jkg -1 K -1 .
Two litres of superheated water at 190°C is mixed with six litres of cold water at 20°C. Find the final equilibrium temperature (in °C) if no heat is lost.
Find the mass (in g) of a copper calorimeter if its temperature rises by 45° when it absorbs 3.6 kJ of heat. The specific heat capacity of copper is 0.4 Jg-1K-1.
The specific latent heat of fusion of ethyl alcohol is 100 Jg -1 . Find the heat absorbed (in J) by 2.25 g of ethyl alcohol when it melts at its melting point of -114°C.
Important Questions from Heat, internal energy and work
2 kg of liquid having specific heat of 3 kJ/kg-K is stirred in a well-insulated chamber causing temperature rise by 15°C. What will be the amount of work done on the liquid (or system)?
Assertion (A): The heat and work transfer cannot be expressed as difference between the end states.
Reason (R): Heat and work are both exact differentials.
Find the heat capacity of a steel vessel of mass 2.5 kg if its temperature rises by 10 degrees. Specific heat capacity of steel is 500 Jkg -1 K -1 .
Two litres of superheated water at 190°C is mixed with six litres of cold water at 20°C. Find the final equilibrium temperature (in °C) if no heat is lost.
Find the mass (in g) of a copper calorimeter if its temperature rises by 45° when it absorbs 3.6 kJ of heat. The specific heat capacity of copper is 0.4 Jg-1K-1.
