Helpmyphysics

This is a wonderful experiment we did in our science classes during Halloween week. Water with some red dye is pushed up a pipe into a conical shaped flask. How does it happen?
Well it has to do with air pressure.
At the start of the experiment some water is brought to a boil in the conical flask. Some of the water that is boiled changes state into a gas which takes up the whole space of the conical flask.
The conical flask is closed with a stopper with a long pipe inserted into the stopper. The flask is then turned upside down and the long pipe is inserted into a beaker containing dyed water.
The water gas cools back into a liquid and his causes a vacuum to exist in the conical flask
This vacuum has much less pressure than the air presure pushing down onto the red dyed water. This results in the red dyed water being pushed up the pipe into the flask. This cools the water gas more causing a bigger vacuum which makes a bigger presure difference. The dyed water the is pushed harder and a fountain appears in the conical flask.
Listen out for a horrendous noise as Dracula sooks up the last of his blood…..
Thanks to Maria Devlin for kindly videoing the experiment.