Get either kazoos or the party favors that open when you blow out on them and show the kids that the same thing happens when you put the end of a balloon over the part you blow in to. Younger children will be amazed by this! Talk about how different gasses weigh differently, then bring in two balloons one blown up by you and one by a helium machine and let the children see the diffidence. This is even more impressive if you can get a helium machine and blow it up before their eyes! Make several sets of balloon pictures. Let your children match them by shape, color, size, or anything else they want to. Very simply this is a science activity to teach children about air. First blow up a balloon. Then let the air out in a way that your children can see the air in action: Some ideas are to put the end over a party favor, to let the air out blowing a peace of cotton, child's hair, etc. Additionally you can show how the air escaping can make noise by pulling the opening tight.

These Preschool Ideas Found At: Everything Preschool >> Themes  >> Circus >> Science