Celsius
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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
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.
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
Celsius
…as the centigrade scale in English), one of two temperature scales used in the International System of Units (SI), the other being the closely related Kelvin scale. The degree Celsius (symbol: °C) can refer to a specific point on the Celsius temperature scale or to a difference or range between two temperatures…
Lord Kelvin, the namesake of the unit of measure.
Thermometer showing temperature in kelvin and degrees Celsius