# Does the electrolyte in a lead acid battery bubble and then evaporate due to the the heat change associated with the electrochemical reactions in the battery or is it something else?

## I think its like the electrolysis of water where u get hydrogen bubbles....

The bubbles are hydrogen gas produced by the electrochemical reaction : $P b \left(s\right) + H S {O}_{4}^{-} \text{(aq)toH^+} \left(a q\right) + 2 {e}^{-}$