Uncle Norm is heading off with his hush hush pals on a camping weekend. He knows that a grown-up needs to drink about one and one-half litres of water everyday, and he’s not totally sure how much a litre is. The the Rads visit a dairy farm tohelp him figure out that one and one-half litres times two, or double, would add upto 3 litres, which would help him get through the two day weekend.

The Gist: Capacity is a measure of the amount of liquid a container can hold. Using the metric system to measure volume: millilitres, litres and kilolitres, children (by Grade 3) will have had experience with measuring liquids in school and at home. Children will have used relational containers to discover that one container holds twice as much liquid as the other, or that one container holds one-fourth as much as another. In the curriculum, children are introduced to capacity using the litre as the unit of measure.