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
Celsius
Videos
The degree Celsius is the unit of temperature on the Celsius temperature scale, one of two temperature scales used in the International System of Units, the other being the closely related Kelvin scal
Temperature
…temperature scales that historically have relied on various reference points and thermometric substances 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…
A thermometer calibrated in degrees Celsius, showing a temperature of 0 °C in a glass of ice and water
Measurement of an ice-water mixture in equilibrium at 370 m above sea level. Thermometer shows 0.05 °C. The slight deviation from 0 °C is due to instrument uncertainty and trace water impurities.
Boiling point of water measured at an altitude of ~370 m a.s.l. The 99.7 °C result reflects lower atmospheric pressure (~970 hPa), combined with minor instrument uncertainty and trace water impurities.