It’s a funny game to fill a balloon with gas.
This interesting exercise doesn’t have to be done without adults’ control. If you want to produce on your own gas to fill your balloon, use the shown method. For this purpose you need a plastic bottle, a little bit of baking soda and a little of vinegar or salt of lemon. Fill 1/3 water in the bottle, add some vinegar or salt of lemon. And after that, add some baking soda. Pull immediately the balloon on the bottle’s neck and it will start to fill with gas, evolved subsequently of the reaction between the two substances. This occupation is extremely funny for kids and at the same time has an educational effect.