Kelvin scale

Definition

The Kelvin scale is an absolute temperature scale starting at absolute zero, the point where all molecular motion ceases. It is used in scientific measurements and calculations due to its direct relationship with thermal energy.

5 Must Know Facts For Your Next Test

1. The Kelvin scale has its zero point at absolute zero, which is 0 K or -273.15°C.
2. One Kelvin unit is equivalent to one degree Celsius in magnitude.
3. There are no negative values on the Kelvin scale; it starts from zero and increases positively.
4. Kelvin is commonly used in thermodynamics because it simplifies the equations involving temperature.
5. To convert from Celsius to Kelvin, you add 273.15 to the Celsius temperature.

Review Questions

• What is the significance of absolute zero on the Kelvin scale?
• How can you convert a temperature from Celsius to Kelvin?
• Why is the Kelvin scale preferred in scientific measurements over other temperature scales?

Related terms

Absolute Zero: The theoretical temperature at which there is no thermal energy and molecular motion ceases, equivalent to 0 K or -273.15°C.

Thermal Energy: The internal energy present in a system due to its temperature, directly related to molecular motion.

\textdegree C (Celsius): A temperature scale based on the freezing and boiling points of water at standard atmospheric pressure, with units equal in size to those of the Kelvin scale but offset by -273.15.