<unk>  refers to a transformation in which a system releases energy (heat) to the surroundings:
When the transformation occurs at constant pressure:
and constant volume:
In an adiabatic system (e.g. a system that does not give off heat to the surroundings), an<unk>  process results in an increase in temperature.
Some examples of<unk>  processes are:
Condensation of rain from water vapour
Combustion of fuels such as wood, coal and oil
Mixing water and strong acids
Mixing alkalis and acids
The setting of cement and concrete
Most polymerisation reactions such as the setting of epoxy resin
Exothermic
Endothermic
Sedative
Flame
Tachycardia causes
Hyperthermia causes
Bradycardia causes
Acidosis