Temperature is a scalar physical quantity that describes hot and cold and is related to the speed of the molecules vibrating and moving inside materials.
Temparature can also be intended as the expression of thermal energy that originates the heat.
In the International System of Units (SI), the temperature is measured in kelvin, however the Celsius scale (°C) is used for most temperature measurements in the majority of the countries except the US where the Fahrenheit scale is still widely used.

These online unit converters are designed to support fast and accurate conversion among several scales of temperature.