Contact a local dive shop and invite one of the divers to visit the class.
Ask the diver to bring and demonstrate the proper and safe use of scuba equipment.
Put on a pair of safety goggles.
Then, pour a small amount of vinegar into a small beverage container.
Place about a teaspoon of baking soda into a balloon.
Slip the neck of the balloon over the neck of the bottle.
Pick up the balloon so that the baking soda falls into the vinegar.
Observe what happens to the balloon as the pressure within the container increases.
Can this observation be applied to diving?
If so, how?
Research the depth limits associated with scuba diving.
Why can't divers descend past a certain depth?
How can dolphins and whales dive to incredible depths while scuba divers are restricted to the near surface waters?