Water alone runs right off a greasy plate, yet a little soap lifts the grease away and twenty seconds of it destroys germs. This short course explains the two-faced surfactant molecule behind it: why water can't clean grease on its own, how soap bridges grease and water, how micelles carry the dirt off, and why soap doesn't just rinse germs away but tears many of them apart.
Water alone runs right off a greasy plate, yet a little soap lifts the grease away and twenty seconds of it destroys germs. This short course explains the two-faced surfactant molecule behind it: why water can't clean grease on its own, how soap bridges grease and water, how micelles carry the dirt off, and why soap doesn't just rinse germs away but tears many of them apart.
