Concept:Evaporation causes a liquid in an open container to lose surface molecules, which lowers the liquid's volume.
Explanation:When a liquid is kept in an open container, its surface is exposed to air.
Particles near the surface gain enough energy to overcome the attractive forces between them.
These energetic particles escape into the air as vapour.
Because liquid molecules leave continuously, the amount of liquid decreases and its volume reduces.
This process is called evaporation and it happens at the surface of a liquid, even below its boiling point.
Brownian motion is the random movement of particles.
Diffusion is the spread of particles when a substance moves from higher to lower concentration.
Sublimation is the change of a solid directly into vapour.
These three options do not cause a liquid's volume to shrink in an open container.
Answer:C. Evaporation