Foam decay time of aqueous 2-amino-2-methyl-1-propano1 mixture was studied experimentally at various temperatures between 20 and 80℃. Foam stability mechanism was changed at 65℃. For the purpose of analyss of these results we assume that the additional barrier of foam decay is proportional to operating temperature. We measure foamability at a various operating temperature and amine concentrations in the aqueous diethanolamine, N-Methyldiethanolamine and 2-amino-2-methyl-1-propanol mixtures. The results showed that density, viscosity and surface tension play an important role in the foamability.