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Science · Grades 5–6

Diffusion

noun

The movement of particles from an area of high concentration to an area of low concentration.

Example Sentences

"The smell of perfume spreads through the room by diffusion."

"Oxygen enters blood cells through diffusion across cell membranes."

Synonyms & Related Terms

dispersalspreading

Quick Check

Which best describes the meaning of diffusion?

Study Tips

To remember diffusion, try writing it in a sentence of your own. Connect it to something you already know about science.

Use it in conversation today — saying a word aloud three times helps lock it into long-term memory.