# What is condensation, and why is it also a warming process?

Consider the reaction: ${H}_{2} O \left(l\right) + \Delta \rightarrow {H}_{2} O \left(g\right)$
Now I have represented heat as $\Delta$, and reasonably, I have to put the kettle onto the stove, turn on the burner, and allow the flame/element to heat the water to get it to boil.
${H}_{2} O \left(g\right) \rightarrow {H}_{2} O \left(l\right) + \Delta$, and this is clearly a condensation reaction; moreover it is a reaction where heat or energy is clearly a product of the reaction; and thus, again reasonably, we may designate this as an exothermic, or $\text{warming}$ process.