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Il y a 3 jours · Heat is energy transferred from one body to another due to a temperature difference. Learn about the units, types, and modes of heat, and how heat relates to temperature and work.
- Heat Transfer
Heat - Conduction, Convection, Radiation: Because heat is...
- Videos
Dive into Britannica’s video collection, where you’ll find...
- British Thermal Unit
British thermal unit (BTU), a measure of the quantity of...
- Caloric Theory
caloric theory, explanation, widely accepted in the 18th...
- Heat of Sublimation
Other articles where heat of sublimation is discussed:...
- Heat of Vaporization
Other articles where heat of vaporization is discussed:...
- Heat Capacity
Heat capacity, ratio of heat absorbed by a material to the...
- Heat of Fusion
Other articles where heat of fusion is discussed: carbon...
- Heat Transfer
18 juin 2024 · Thermodynamics, science of the relationship between heat, work, temperature, and energy. Thermodynamics deals with the transfer of energy from one place to another and from one form to another. The key concept is that heat is a form of energy corresponding to a definite amount of mechanical work.
11 juin 2024 · Understanding the microscopic and macroscopic characteristics of heat has been crucial for metallurgy and materials science, mining, refineries, a large variety of chemical reactions,...
19 juin 2024 · temperature, measure of hotness or coldness expressed in terms of any of several arbitrary scales and indicating the direction in which heat energy will spontaneously flow—i.e., from a hotter body (one at a higher temperature) to a colder body (one at a lower temperature).
13 juin 2024 · Heat is important to life on Earth. Plants and animals need heat for such things as growth and reproduction. On Earth, the main source of heat is the Sun. Other sources of heat include the Earth's core and chemical reactions. The Sun is also an important source of heat in our Solar System.
22 juin 2024 · Doctors have long warned that rising temperatures lead to conditions like heatstroke — a life-threatening medical emergency where your body simply can't stop overheating — or exacerbate...
Il y a 3 jours · Temperature is a physical quantity that quantitatively expresses the attribute of hotness or coldness. Temperature is measured with a thermometer. It reflects the average kinetic energy of the vibrating and colliding atoms making up a substance.
