Why do my swimming goggles fog up?
Fogging is mainly due to the temperature difference between the body and the water.
As the body is warmer than the practice environment, fogging occurs on the inside of the lenses through evaporation.
As a result, every micro-drop of perspiration will stick to the inside of the goggles.
In fact, it’s a bit of luck: all these drops will eventually combine to create a film of water through which you can see clearly.