offgassing

This term is defined in ECSS-Q-ST-70-01C as
evolution of gaseous products from a liquid or solid material into an atmosphere

This term is defined in ECSS-Q-ST-70-29C as
evolution of gaseous products for an assembled article subjected to slight radiant heat in the specified test atmosphere

This term is defined in ECSS-S-ST-00-01C as
outgassing under atmospheric or near-atmospheric pressure