This Activity Requires:
Important! If you cannot launch anything from this database, please follow the step-by-step instructions on the software page.
Please Note: Many models are linked to directly from within the database. When an activity employs our scripting language, Pedagogica, as do some of the "guided" activities, the initial download may take several minutes. Subsequent activities will not take a long time. See this page for further instructions.
A molecular sieve separates molecules by size.
Additional Related Concepts
Sieves are the simplest methods of separating particles, and there are even sieves with pores so fine that they can separate molecules. Most naturally occuring solids are not porous, but zeolite is a natural mineral that is rich in pores and it is frequently used as a filter.
Frontier scientists are busy inventing new materials whose pore size can be controlled.