Is it possible to pour air over ?

(according to project by Pavel Cerný, Matrin Lopatár a Aleš Sirný z KMD ZŠ Klobouky by Brno)

Materials: 2 small plastic bottles, one big bottle with water

Preparation and application:

• cut off top part of 2 small bottles - you will get 2 bottles
• one of them put into big bottle with water so it is full of water
• keep it under water nad turn it top to bottom
• secomd bottle put into water so it is full of air (see a picture)
• notice that water is not going into second bottle
• bottle with air turn a bit on one side, when it´s edge is under opening of the second bottle with water

Explanation:

• bubbles of air swim up, because air´s density is lower then density of water
• air push under water
• look at this experiment with chin up, prelévání vzduchu vám bude pripadat úplne prirozené.