Radiation
The Transfer Of Energy Through Electromagnetic Waves.

Thermal Expansion
The Increase In Size Of A Material As Its Temperature Rises, Related To Particle Motion In Thermodynamics.

Absolute Zero
The Lowest Possible Temperature, At Which Particles Have Minimum Thermal Energy, Central To The Third Law Of Thermodynamics.

Phase Change
A Transition Between States Of Matter Such As Melting Or Boiling, Involving Absorption Or Release Of Heat.

Latent Heat
The Heat Required For A Phase Change Without A Change In Temperature.

Temperature
A Measure Of The Average Kinetic Energy Of Particles In A Substance.

Evaporation
A Phase Change In Which A Liquid Becomes A Gas At The Surface, Requiring Heat Input.

Condensation
A Phase Change In Which A Gas Becomes A Liquid, Releasing Heat.

Thermal Conductivity
A Measure Of How Well A Material Transfers Heat Through Conduction.

Thermal Equilibrium
A State In Which Two Objects In Contact Have The Same Temperature And No Net Heat Flow Occurs.