Activities Related to Pressure
Find out how air pressure changes in different circumstances. You will need a barometer for this.

Take your barometer for a walk up the nearest hill, the higher the better. You can also do this with a tall building, such as a tall church tower.

Compare Pressure Variations
Measure pressure at a number of stages as you go up the hill. Compare the results and try to keep a record of the height of each stage as well as the time.