Instant Defogger

You will need:

1. Water
2. Dish-washing liquid soap
3. 2 empty drinking glasses
4. Fridge

INSTRUCTIONS

1. Take an empty drinking glass and place it in the fridge to cool.
2. Take the other glass and make a solution in it by mixing 1 teaspoonful of dish-washing liquid soap with 15 teaspoonfuls of water. Mix it well.
3. Remove the glass from the fridge and wipe a specific portion of the glass with the solution. (Note: do not wipe the entire glass, just a specific area with the soap solution.)
4. Place it back in the fridge till it dries.
5. Once it has dried, remove it from the fridge and observe it as part of the
   glass begins to fog up.

Create a simple solution to defog any glass in the house.

RESULT

The part that was wiped down with the soap solution would not have fogged up, even when the entire glass is fogging up. Due to heat and humidity in the atmosphere, water vapour condenses on cold surfaces like glasses or mirrors. This condensation is nothing but tiny water droplets, which have curved surface. As soon as light hits the water droplets, it scatters everywhere on account of the curved surface of the droplets making it foggy. But when we wipe the glass with a soap solution, we are coating the glass with a film which is made up of molecules which on one end hate water and hence cling on to the glass and the other end which loves water, and hence forms the top layer. As other water droplets settle onto the top layer of soap solution, they settle evenly on the entire surface making the light pass straight through.