Osmosis

Definition

The movement of water from an area of low solute concentration to an area of high solute concentration across a semi-permeable membrane.

Related terms

Hypertonic Solution:

This is like a super popular concert - it has more solutes (people) so water (other attendees) wants to go there.

Hypotonic Solution:

This is like a less popular concert - it has fewer solutes so water tends to leave this area.

Isotonic Solution:

This is like two concerts with equal popularity - water doesn't preferentially move towards either because they have equal amounts of solutes.