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Heat as energy transfer
Beginner
Heat is energy flowing due to temperature difference.
Heat is energy transferred due to a temperature difference, not a stored substance. It can be converted to work only partially.
Rubbing hands warms them: work becomes thermal energy.
Objects contain internal energy, not heat.
In more detail
Heat is energy transferred because of a temperature difference. It is a form of energy transfer, not a stored quantity, and it is included in energy conservation.
Real-world uses
- Heating water with an electric element transfers electrical energy as heat.
- Boiling kettles convert electrical energy into thermal energy of the water.
- A hot cup of tea cools because heat flows from it to the cooler room, transferring energy with no work being done.
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Frequently asked questions
Is heat stored in an object?
No. Thermal energy is stored, but heat describes the transfer of that energy.
Do heat and work measure the same thing?
Both are energy transfers, but work is organised motion and heat is disordered microscopic motion.
Is heat the same as temperature?
No. Heat is energy transferred because of a temperature difference, while temperature measures the average energy of particles.
Related topics in Work, Energy & Power
Rotational kinetic energy · Rolling without slipping energy · Work done by gravity on incline · Mechanical equivalent of heat · Mass–energy equivalence · Sources of energy