You can try marshmallows rather than soapy water, to see the effect that pressure has on them. Dry the bottle as much as you can before putting the marshmallows in. You don't need to shake the ...

Even everyday things we do can have an unexpected effect on our blood pressure. But can drinking from plastic water bottles have that kind of effect as well?

Practise and challenge your friends! Download the Water bottle Rockets PDF(378 Kb). Adobe Acrobat is required. SAFETY: This rocket uses air pressure to fling a bottle at high speed 20–50 metres.

Rocket will NOT fly straight without an aerodynamic nose cone made from a second soda bottle and use only 1 cup (200 ml) of water. Kit includes StratoLauncher IV, StratoFins, ball head ...

the pressure is greatest on the base, and then on the semi-circular portion where the bottle bulges out. When constructing a canal, or water course, the sides should incline from the base outward ...