out·gas 
(outgăs′)
(outgăs′)v. out·gassed, out·gas·sing, out·gas·ses
v.tr.
1. To cause (something) to emit vapors over time, as by evaporation or a slow chemical reaction.
2. To emit (vapors) over time, as by evaporation or a slow chemical reaction.
v.intr.
1. To emit vapors over time, as by evaporation or a slow chemical reaction.
2. To escape in gaseous form over time, as by evaporation or a slow chemical reaction.