Possible suggestions are to blow up a balloon with one breath, push the balloon under the water in a bucket filled to the top that is sitting in a larger bucket or pan to catch the overflow, and measure the amount of water in the overflow. Students try their measurement plans and compare their results. Students can do some research to find the average lung capacity for humans of their age and compare it to their results. The student applies measurement concepts. Clarifying Activity Students estimate the number of cups needed to fill a gallon milk jug, then use a measuring cup to pour water into the jug.
Students use a marker to mark the level of water in the jug after each cup of water is added.
Students can repeat the activity with a liter bottle and a 100-milliliter graduated cylinder to determine how many of the graduated cylinders it takes to fill one liter.