Heat
/hit/
noun
Thermal energy.
“This furnace puts out 5000 BTUs of heat. That engine is really throwing off some heat. Removal of heat from the liquid caused it to turn into a solid.”
The condition or quality of being hot.
“Stay out of the heat of the sun!”
An attribute of a spice that causes a burning sensation in the mouth.
“The chili sauce gave the dish heat.”