Why is the Kelvin temperature scale used in science?
The Kelvin temperature is an absolute temperature scale.
The Kelvin scale starts at absolute zero. 0 degrees Kelvin represents zero kinetic energy or temperature. Because of this a change from 100 degrees Kelvin to 200 degrees Kelvin represents a doubling of the kinetic energy of the system.
As Volume is directly related to Temperature a doubling of the temperature in Kelvin will result in a doubling of the Volume.
A change in Celsius or Farenheit is not directly related to kinetic energy or volume as these scales do not start at zero.
Scientists use the Kelvin scale because it is an absolute temperature scale that relates directly to kinetic energy and volume.