Rainy Day Delights

This activity provides a practical context for measuring capacity and constructing a scale for solving a technology problem.
Get students to read through the instructions. After reading the fifth and sixth points, ask students “What do you think is the reason for these two instructions?” The discussion should clarify the need for an accurate starting point and the difficulty that students would have if they tried to mark the starting point at the base of a bottle with a dimpled base. Make sure students fill carefully to the 0 mark. They may need to use a dropper, and they should have their eye level with the 0 mark on the scale.

When they punch the holes in the bottle cap, get students to use small nails, such as brads, and make sure they do not make too many holes. Two or three holes will be enough. (Large holes or too many holes could represent a flash flood!)

A challenging investigation would be to explore the rate of flow for different numbers of nail holes. Students could draw up a table that shows the amount poured after 1 minute. You could ask them to see if they can predict the increase in flow as they punch another hole in the cap.
Further information on weather and related topics can be found in the Ministry of Education’s Making Better Sense of Planet Earth and Beyond (Wellington: Learning Media, 1999.)

Answers to Activity

1. Answers will vary.
2. Practical activity