Absolute zero
Absolute Zero
Absolute zero (pronounced: /ˈæb.sə.luːt ˈziː.roʊ/) is the lowest possible temperature where nothing could be colder and no heat energy remains in a substance. It is the point at which the fundamental particles of nature have minimal vibrational motion, retaining only quantum mechanical, zero-point energy-induced particle motion.
Etymology
The term "absolute zero" comes from the concept of absolute temperature, a theoretical temperature scale that becomes negative at extremely low energies. The word "absolute" is derived from the Latin word "absolutus", meaning "freed, unrestricted". The term "zero" comes from the Arabic word "sifr", which means "empty" or "nothing".
Related Terms
- Thermodynamics: The branch of physical science that deals with the relations between heat and other forms of energy.
- Temperature: A measure of the warmth or coldness of an object or substance with reference to a standard value.
- Kelvin: The SI unit of thermodynamic temperature, equal in magnitude to the degree Celsius.
- Quantum mechanics: A fundamental theory in physics that provides a description of the physical properties of nature at the scale of atoms and subatomic particles.
- Zero-point energy: The lowest possible energy that a quantum mechanical physical system may have.
See Also
External links
- Medical encyclopedia article on Absolute zero
- Wikipedia's article - Absolute zero
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