Key Stage 5
Meaning
Absolute temperature is the measure of temperature starting from absolute zero, typically measured in Kelvin (K).
About Absolute Temperature
- Absolute temperature uses the Kelvin scale, where 0 K represents *absolute zero.
- Absolute zero is the point where a system has minimum internal energy.
- The Kelvin scale is an absolute thermodynamic temperature scale.
- Absolute temperature differs from Celsius and Fahrenheit scales in that it starts at absolute zero.
- Absolute temperature is crucial for calculations in thermodynamics and statistical mechanics.
- At absolute zero, entropy of a perfect crystal is zero according to the third law of thermodynamics.
- Kelvin is defined based on the triple point of water (the temperature and pressure at which water can exist as a solid, liquid or a gas) simultaneously, precisely 1/273.16 of the thermodynamic temperature of the triple point of water.
Examples
The temperature of liquid nitrogen is 77 K. Room temperature is approximately 293 K on the Kelvin scale.