Temperature
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In classical thermodynamics and kinetic theory, temperature reflects the average kinetic energy of the particles in a system, providing a quantitative measure of how energy is distributed among micros
A typical Celsius thermometer measures a winter day temperature of −17 °C.
Plots of pressure vs temperature for three different gas samples extrapolated to absolute zero
An illustration of the range of cosmic temperatures
Kelvin
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The kelvin is the base unit for temperature in the International System of Units. The Kelvin scale is an absolute temperature scale that starts at the lowest possible temperature, taken to be 0 K. By
Temperature
…for definition. The most common scales are the Celsius scale with the unit symbol °C (formerly called centigrade), the Fahrenheit scale (°F), and the Kelvin scale (K), with the third being used predominantly for scientific purposes. The kelvin is one of the seven base units in the International System of…
An ice water bath offered a practical calibration point for thermometers (shown here in Celsius) before the physical nature of heat was well understood.
Lord Kelvin, the namesake of the unit of measure.
Thermometer showing temperature in kelvin and degrees Celsius