Dry ice bubble by Luca and Lucas

(science experiment 3)

Equipment :

• Gloves
• (Transparent) basin with a large rim
• Strip of fabric (cotton)
• Graduated cylinder
• Weighing scale
• Spoon

Substances :

• Solid carbon dioxide
• Water
• Dish soap
• Glycerin

Safety :

Dry ice is extremely cold : -7.5°C !!!

If you touch the dry ice, you'll cause injury similar to a burn.

Experiment :

First, we are going to prepare the soap mixture.

1. Pour 50mL of water in a large jam pot.
2. Add 10g of sugar. Mix the ingredients.
3. Add 40mL of dish soap. Doesnt stir !
4. Add 20mL of glycerin. Stir gentli (no too fast because bubles will appared !)
5. Add 80mL of water. Stir again.

Now, let's make a giant dry ice bubble!

1. Fill 2/3 of the basin with water.
2. With your oven mitt, take a piece of dry ice (with the gloves, of course) and put it gently in the water. Do not throw it !
3. Stretch it and slowly rub it along  the edge of the basin in order to create a single bubble.
4. Wait for the bubble to grow and burst.
5. You can do it again if you have the time. (you can do the experiment again replacing water by a soft drink with quinina to observe under ultraviolet light)