Why do goggles fog?
Goggles fog because the air inside your goggles is moist (it picks up water vapor both from the atmosphere in the pool when you put your goggles on and from the surface of your eyes) and the fact that this air is kept warmer than the water outside. The temperature of your goggle lens drops due to the cooling effect of the water and when a certain temperature (known as the dew point) is reached, the water vapor in the air inside the goggles condenses into plain old water on the surface of the lens -condensation, just like you get on the inside of a car windshield. This layer of condensation is what causes your view to be obstructed. How Can I Stop Them Fogging? A few things can help to prevent this from happening, only a couple of which are really practical. For example you could regulate the moisture content or temperature of the air inside your goggles to prevent the dew point from being reached, but this would be very impractical. The two most successful solutions are: • Allow a smal
