Why does the lid get wet when you put it on simmering soup?

The lid gets wet when you put it on simmering soup due to condensation. Here's why:

1. Evaporation: When soup simmers, water molecules in the liquid gain energy and escape into the air as steam.

2. Cooling and Condensation: This steam rises and hits the cooler surface of the lid. As it cools, the steam molecules lose energy and change back into liquid water, forming tiny water droplets.

3. Water Droplets: These droplets accumulate on the underside of the lid, making it wet.

In essence, it's a cycle of evaporation and condensation happening within your pot!