Describe the water by its observable properties. n STEP 2: Insert the balloon into the water bottle and pull the neck of the balloon over the outside of the bottle.

Put some hot water in another container, then submerge the water bottle with the balloon in the hot water. There's air already in the bottle, but it's room temperature.

SAFETY: This rocket uses air pressure to fling a bottle at high speed 20–50 metres. The bottle must be made entirely of plastic, it must have no sharp points and it must be for a fizzy drink, so ...

Water bottle; Straw; Balloon; Water; Something to seal the straw (duct tape, playdough, glue, etc.) How to set it up: To set this up you will need to poke a hole in the water bottle, in the middle ...

Because the water leaving the bottle left room for the air inside the balloon to enter the bottle. Even though you couldn't see it, as the water leaked out, the bottle was slowly filling with air ...

This rocket is made out discarded soda bottles and fueled with pressurized water. No, not the kind of bottle rockets you used to light with a match and fire recklessly at your cousins.

Cut a small hole in the top of the water bottle, just big enough to push the straw through. ... Launch a Balloon Rocket, from Scientific American Science Activities for All Ages!, ...

Idaho State University's Physics Department students taught the kids a little about physics and showed them how to build ...