Diffusion distance
What Diffusion distance means in Combined Science GCSE, as defined for AQA.
Definitions of Diffusion distance
Exam boards and our study guides word this term in slightly different ways. Learn the version your board uses.
Check what you remember
Read the wording for your board, then hide it and explain Diffusion distance in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
A shorter distance increases the rate of diffusion because particles travel less far to cross the exchange surface.
A thin wall in the small intestine and lungs shortens this, which the note links to the rate of diffusion.
Topics that use Diffusion distance
- Diffusion (AQA GCSE)
Related terms
- Adaptations of exchange surfaces
- Blood supply
- Cell size and organism size
- Concentration gradient
- Diffusion
- Diffusion and exchange surfaces
- Exchange surface
- Exchange surfaces
Using Diffusion distance in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
Practise Combined Science questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
A week of Premium from your first lesson · Then the free plan continues · No card, no charge