There is a temperature at which the molecules stop moving. That temperature is called Absolute Zero . For scientific work with the energy of molecules, it is good to have a starting point where nothing is moving. Thus a scale was determined, based on the Celsius scale, but with a starting point at absolute zero. This is called the Kelvin scale.
Some strange things happen near absolute zero.
One thing is that electricity moves through a wire without resistance. Another is that the gas Helium becomes a liquid that flows up along the sides of a glass container. Converting between systems Since Fahrenheit is used in the United States and Celsius is used elsewhere, you may have to convert degrees from one system to another. Use the reset button to clear the numbers. In conclusion The temperature of an object is the average energy of its molecules.