diffusion
Pronunciation
Noun
B1 Intermediate
Quick answer
The gradual spreading out of particles from an area of high concentration to an area of low concentration.
Test yourself
Which word fits the gap? "_____ allows oxygen to pass from the lungs into the bloodstream."
Answer: diffusion
In your own words, what does "diffusion" mean?
The gradual spreading out of particles from an area of high concentration to an area of low concentration.
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