The coldest theoretical temperature is absolute zero, at which the thermal motion in matter would be zero. However, an actual physical system or object can never attain a temperature of absolute zero. Absolute zero is denoted as 0 K on the Kelvin scale, −273.15 °C on the Celsius scale, and −459.67 °F on the Fahrenheit scale.
The kinetic theory offers a valuable but limited account of the behavior of the materials of macroscopic systems. It indicates the absolute temperature as proportional to the average kinetic energy of the random microscopic motions of their constituent microscopic particles such as electrons, atoms, and molecules.
Thermal vibration of a segment of protein alpha helix: The amplitude of the vibrations increases with temperature.
Temperature is important in all fields of natural science, including physics, geology, chemistry, atmospheric sciences, medicine, and biology—as well as most aspects of daily life.
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