The important foam stability factors are: 1. Surface tension 2. Concentration of separate phase 3. Presence of foaming agent to lower surface tension 4. Viscosity of liquid - the higher the viscosity, the more stable the foam. 5. Presence and thickness of adsorption layer (a 3rd stabilizing material).The important foam stability factors are: 1. Surface tension 2. Concentration of separate phase 3. Presence of foaming agent to lower surface tension 4. Viscosity of liquid - the higher the viscosity, the more stable the foam. 5. Presence and thickness of adsorption layer (a 3rd stabilizing material)