Discover how our lungs work in this fun science experiment for kids. In this science experiments, students will demonstrate how air is taken in through the mouth and nose, passes down the windpipe and into our lungs.

Materials:

• Plastic bottle
• Straw
• Elastic band
• Scissors
• Two balloons
• Play dough

Instructions:

• With adult supervision, use the scissors cut off the bottom of the bottle.
• Tie a knot in one of a balloon and snip off the other end.
• Stretch this end around the bottom of the plastic bottle.
• Put a straw in the neck of the other balloon and secure it tightly with the elastic band. Be sure not to crush the straw because the air must flow through in order to inflate the balloon.
• Put the straw and the balloon into the neck of the bottle. Secure with the play dough by making a seal around the bottle. Again, be sure not to crush the straw.
• Hold the bottle and pull the knot of the balloon at the bottom. What happens?
• Students will discover that the balloon inside the bottle inflates, and as they let go it deflates.

Source: http://www.science-sparks.com/2012/04/13/breathing-making-a-fake-lung/