This Blows! Using a straw, see who can blow a series of plastic cups off the end of the table first. Another spin on this game is to use the air from a balloon instead of a straw to move the cup – this makes it much more challenging!
▷ Fiestas Infantiles ⇒ Ideas Originales y Divertidas de Cumpleaños
Balloon Rockets - I've done this in several science camps I've conducted. Kids have fun with it. But, when the balloon deflates it may fall off the straw because it's surface area changes - another good thing to show and explain to kids.