The dry ice bubble (science experiment 3) BNS

We need :                                                

• gloves                                                    
• basin with a large rim
• strip of fabric
• graduated cylinder
• weighing scale
• small dish
• spoon

Substances :

• solide carbon dioxide
• water
• dish soap
• sugar
• glycerin

Caution!!! The ice is very very cold at -78.5°C!!!

Protocol :

Stir sugar, glycerin, water and dish soap with spoon. Fill a basin at 2/3 of water and put a piece of dry ice in a basin. Soak a strip of fabric in the mix and pass it on the rim of the basin.

Observations :

The mix creates a single bubble on the rim of the basin and it seems the water is boiling. At around 40 seconds it explod.

Conclusion :

The experiment shows different changes of states :

1. The solid carbon dioxide becomes gas, it's sublimation
2. The gas becomes liquid, it's condensation.