The movement of water molecules through a semipermeable membrane is called:

• Osmosis:
Osmosis is the process by which solvent molecules pass from a solution of lower concentration to a solution of higher concentration through a semipermeable membrane.
It is a passive process that takes place without any expenditure of energy.
Osmosis is the passage of water from the region of higher concentration to the region of lower concentration through a semi-permeable membrane.
A plasma membrane or a cell membrane is a semipermeable or selectively permeable membrane that lets only certain molecules pass through it while keeping other molecules
Movement is controlled by the osmolarity of two compartments.
Sodium regulator of extracellular osmolarity.
Potassium regulator of intracellular osmolarity.

🔴Additional Information::
Diffusion
Diffusion is the process of particles moving from a highly concentrated region to a low concentrated region.
The rate of diffusion of gases is higher when compared to liquids and solids as gases can move freely from one region to another.
Diffusion is only possible if the matter moves continuously as diffusion means the moving of particles from a high concentration to a low concentration region.