- This Stirrup Pump with gauge is perfect for schools and teams to inflate numerous ball efficiently – but is also a great aid in the classroom.
Scientific Sue uses this pump for her Cloud in a Bottle Demonstration and her water rocket demonstrations.
Features an air pressure tank. spring clip valve lock, reinforced air hose and a fold down footplate.
- Quick and easy to use
- Standard size needle ( included)
In the Cloud in a Bottle demonstration, the students directly observe a cloud from right before their eyes – and when the bottle is connected back to the pump and the air pressure is increased they will see the cloud disappear!
Cloud formation is part of the water cycle, but one we usually cannot see up close.
A cloud is a large collection of very tiny water droplets or ice crystals. The droplets are so small and light that they can float in the air. When warm air rises carrying with it evaporated water, it expands and cools. Cool air cannot hold as much water vapour as warm air, so some of the vapour condenses onto tiny pieces of dust that are floating in the air and forms a tiny droplet around each dust particle. When billions of these droplets come together they become a visible cloud.
This demonstration shows how water in the atmosphere can be made visible by changes in pressure and temperature.
- Describe and illustrate the water cycle and associate parts of the cycle with weather conditions.
- Observe and describe changes to the properties of water when it is heated or cooled and associate these changes with weather conditions.
- Clean 2 L plastic bottle
- Cork with inflating needle
- Stirrup or bicycle pump
- rubbing alcohol
- Safety Goggles