Why Bathroom Mirrors Fog Up, and How Soap Stops It

Why does a bathroom mirror fog up in the shower when water is perfectly clear? A smooth film of water would be invisible. The problem is the shape the water takes: millions of tiny beads on the glass. You will learn how warm shower air drops its water at the dew point on the cooler mirror, why surface tension gathers that water into tiny domes, and how each dome acts as a little lens that scrambles the image. We explain why a fogged mirror looks bright and white instead of dark, why ground glass and powdered sugar look white for the same reason, how soap turns beads into a flat film, how heated mirrors and car demisters stop condensation, and why clouds are white. Chapters: 0:00 The White Mirror 1:09 Warm Air and Dew Point 2:16 Water Forms Tiny Beads 3:20 Millions of Tiny Lenses 4:25 Why Fog Looks White 5:29 The Soap Trick 6:33 Heat, Car Windows and Clouds #Physics #Science #EverydayScience #LifeHacks