Defogging Glass.

Glass is a very good conductor of heat. Because glass can conduct heat well, it also transfers cold extremly well too.

All around everywhere there are water molecules flying around. The reason they fly around is because they have alot of kenetic energy - or heat. The warmer an atom or group of atoms are, the more kenetic enegy they have, and the more they’ll move around. When a hot molicule bumps into a colder molecule, the hot moleculewill give some of its heat to the colder molecule. They fly around sharing this kenetic energy until they are all even in tempurature.

Since glass is a good conductor of heat it can absorb heat fast. So when a warm water particle bumps into warm glass, there’s hardly any energy transference, and since the water particle is already warm, it has enough energy to escape the glass’s grasp.

So what happens when the glass is cold (near freezing)? Well the water molecule will loose enough energy that it does not have enough to escape the glass’s grasp and will find itself stuck on it.

Water likes to stick to water. Once water starts to mist up the glass, you will find that it quickly gets very hard to see through. Wiping the glass will of course clear the glass, but it will not fix the problem. Within 5-10 minutes you will find that the glass is just as misty as it was before you wiped it!

So how do you fix this pernamentely? Simple. Heat up the glass. The glass will then pass its kenetic energy (heat) to the water that is laying on it. Once the water has enough energy to escape the glass’s grasp it will evaporate off on its merry way, and you will be able to see.

You see this invention on the dashboard of most cars. The demister.

Every go skiing? Put your goggles close to your body so they are kept warm. When you need to use them simply put them on. It should take a while before they start to fog up.

I hope this has helped you and if you have any ideas, please post a comment =).