What Do You Mean Thermal?

Thermal means caused by or related to heat or temperature. The word thermal is used in science to describe a specific kind of energy: thermal energy. Thermal energy is produced by heating up molecules and atoms until they move fast enough to collide into each other.
ther·​mal | \ ˈthər-məl \

1a : of, relating to, or caused by heat thermal stress thermal insulation

b : being or involving a state of matter dependent upon temperature thermal conductivity thermal agitation of molecular structure

c : having low energies of the order of those due to thermal agitation thermal neutrons

2 : designed (as with insulating air spaces) to prevent the dissipation of body heat thermal underwear

3 [Latin thermae public baths, from Greek thermai, plural of thermē] : of, relating to, or marked by the presence of hot springs thermal waters

: a rising body of warm air