Gas: when the water has evaporated and is now out in the air. Water molecules move super fast during this stage.
Liquid: Water molecules have a good amount of space to move around, but they aren’t traveling as fast as they do in the gastric state.
Solid: ice in other words, the water molecules are super tight and compact, but are still moving around, just not very fast.
Polar air masses are characterized by cold air near the surface while tropical air masses are warm or hot.
