Explain water that vanish out of an open container in terms of the kinetic molecular theory of matter
According to the kinetic molecular theory of matter, all particles in a substance are constantly in random motion. In the case of water in an open container, the particles of water are moving about quickly and colliding with each other and the walls of the container. As they move around, some of the water particles near the surface gain enough kinetic energy to break free from the attractive forces holding them in the liquid state. These individual water molecules then evaporate into the air as water vapor.
Over time, as the water molecules continue to gain energy and evaporate into the air, the overall level of water in the container decreases until eventually all the water has evaporated completely. This process of water molecules escaping from a liquid into a gas is known as evaporation, and is a common occurrence when there is an open container of water exposed to the air.