I'm not too prudish to say it: kids think farting in the bathtub is hilarious. Why? Because it makes bubbles! Has your child ever wondered why a fart creates bubbles in the bath? Harness your kids natural curiosity for an easy science project that teaches them how bubbles are made.
It's a great bath time science project, with the bonus of helping kids who hate baths but need to get clean actually get in the bathtub!
Plastic container, such as a large yogurt container
Scissors, or other object that will cut the contaner
Water, deep enough to cover the container by several inches
Enthusiastic young scientist
Poke a hole in the bottom of a plastic container with the scissors. We used a large yogurt container.
Covering the hole completely with your finger, submerge the container open side down until it rests on the bottom of the tub.
Firmly holding the container down on the bottom of the tub, take your finger off the hole and watch the bubbles escape.
Discussion and Extension Activities
Chat with your kid about how air escapes. It rises because it is lighter than the water.
You can also demonstrate suction by lifting the container slowly out of the water. Show kids how to feel the pull of the suction-action as you lift the container from the bottom of the tub.
Compare different size containers and test how many bubbles each size makes, the strength of the suction and so forth. We had lots of fun watching whose container would make the most bubbles, whose lasted longer, etc.
Just like our frozen word scramble bath activity, this was so much fun for and my kid was pretty disappointed when it was time to get out of the bath. But really, the water was stone cold by then!