1. Thermal 3

2. Thermodynamic Scale Kelvin 0K is absolute zero
A change of 1 K is the same as a change of 1 degree celsius.
The lowest possible temperature
Empty space is 2.73K

3. Absolute Zero
At 0K the internal energy U of any system is at it’s lowest possible value, it can not be cooled further (theres no energy left)

4. Law’s of Thermodynamics
Zeroth law of thermodynamics: If two systems are in thermal equilibrium respectively with a third system, they must be in thermal equilibrium with each other.
First law of thermodynamics: Energy can not be created or destroyed. Change in internal energy = heat transfer + work done.
Second law of thermodynamics: The entropy of a system not in equilibrium will increase over time.
Third law of thermodynamics: The entropy of a system approaches a constant value as the temperature approaches absolute zero.

5. A C B Thermal Equilibrium Thermal energy travels from hot to cold.
If two bodies are at equilibrium there is net
transfer (but it will move back and forward)