gas exchange

The diffusion of gases from an area of higher concentration to an area of lower concentration, especially the exchange of oxygen and carbon dioxide between an organism and its environment. In plants, gas exchange takes place during photosynthesis. In animals, gases are exchanged during respiration.

Nearby words

  1. gas chromatography,
  2. gas coal,
  3. gas dynamics,
  4. gas engine,
  5. gas equation,
  6. gas field,
  7. gas fitter,
  8. gas fitting,
  9. gas furnace,
  10. gas gangrene

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.