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Learners investigate the concept of humidity by using a dry and wet sponge as a model. They determine a model for 100% humidity, a sponge saturated with water.

In this activity, learners hook up a hair to a lever system and create a hair hygrometer to measure changes in humidity.

Learners build a simple aneroid barometer to learn about changes in barometric pressure and weather forecasting. They observe their barometer and record data over a period of days.

In this activity, learners observe the effect of transpiration as water is moved from the ground to the atmosphere.

Learners develop an understanding of air pressure in two different activities.