text: * Evaporation
  * Sublimation
  * Cracking of alkanes
  * Thermal decomposition
  * Hydrolysis
  * Nucleosynthesis of elements heavier than nickel in stellar cores
  * High-energy neutrons can produce tritium from lithium-7 in an endothermic process, consuming 2.466 MeV. This was discovered when the 1954 Castle Bravo nuclear test produced an unexpectedly high yield.
  * Nuclear fusion of elements heavier than iron in supernovae
  *Dissolving together barium hydroxide and ammonium chloride
  *Dissolving together citric acid and baking soda