A look at a range of day-to-day examples of separating liquids and solids. This is something that we regularly do with the help of a sieve or filter. Examples include fish being caught in a net, spaghetti being drained in a colander, chips being lifted out of fat using a basket, a dishwasher filter, and a coffee filter.

First broadcast:
9 October 2007

Students could be asked to think of real life examples where we are required to separate solids and liquids. Provide students with one large mixture of solids of different sizes including salt within a pot of coloured liquid. They could then be presented with a number of devices for separating and filtering, such as filter paper, a sieve or colander. Using the information from this clip students could attempt to separate all of the solids from the liquid. Using salt within the mixture will test the students’ knowledge further, and provide opportunity for greater challenge.