heat

Also known as amount of heat, heat energy, quantity of heat

In thermodynamics, heat is defined as the form of energy crossing the boundary of a thermodynamic system by virtue of a temperature difference across the boundary. A thermodynamic system does not contain heat. Nevertheless, the term is also often used to refer to the thermal energy contained in a system as a component of its internal energy and that is reflected in the temperature of the system.

AI overview

Heat is energy that flows between objects or systems when there's a temperature difference between them, crossing from the warmer side to the cooler side. Understanding heat matters because it explains how energy moves in the physical world and is fundamental to how machines, weather systems, and countless natural processes work.

AI-generated from the Wikipedia summary — may contain errors.

Key facts

Physical quantity.name: Heat
Physical quantity.image: Glowing metal.jpg
Physical quantity.caption: A glowing-hot metal bar showing incandescence, the emission of light due to its temperature, is often recognized as a source of heat.
Physical quantity.unit: joule
Physical quantity.otherunits: British thermal unit, calorie
Physical quantity.symbols: Q
Physical quantity.baseunits: kg⋅m2⋅s−2
Physical quantity.dimension: wikidata

via Wikipedia infobox

Wikidata facts

Image: Hot metalwork.jpg

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Commons category: Heat

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~63 min read

Article

38 sections

Contents

Notation and units
History
17th century–early 18th century
"Heat is motion"
18th century
Heat vs. temperature
Evaporative cooling
Discovery of specific heat
Degrees of heat
Discovery of latent heat
First calorimeter
Classical thermodynamics
Clausius (1850)
James Clerk Maxwell (1871)
Bryan (1907)
Carathéodory (1909)
Planck (1926)
Heat transfer
Heat transfer between two bodies
Heat engine
Heat pump or refrigerator
Macroscopic view
Microscopic view
Calorimetry
Engineering
Latent and sensible heat
Heat capacity
"Hotness"
Classical thermodynamics
Heat and enthalpy
Heat and entropy
See also
Notes
References
Quotations
Bibliography of cited references
Further bibliography
External links

Calorimetry is measurement of heat by its effect on the states of interacting bodies, for example, by the amount of ice melted or by change in temperature of a body.