Condensation is the process by which water vapor in the air turns into liquid water. When you boil water, the water vapor rises and comes into contact with the cooler lid of the pot. The vapor condenses on the lid and forms water droplets.

The following are the factors which can affect the rate of water vapour droplets forming:

Surface temperature: The cooler the lid, the faster the water vapour will condense. This is because the water molecules will have more energy to lose in order to turn into liquid water.

Humidity: The more humid the air, the slower the water vapour will condense. This is because there are already a lot of water molecules in the air, so the water vapour has less room to spread out and cool down.

Air movement: The more air movement there is, the faster the water vapour will evaporate. This is because the air will carry away the water molecules and prevent them from condensing on the lid.