One of my friend he told me how i can do this, just follow my step:
1.Mix one teaspoon of dry yeast + 4 teaspoon of sugar in half a glass of water.
2.Pour into a clean bottle.Tie a ballon firmly at the mouth of the bottle.Keep in a warm place for 30-40 minutes.
3.The mixture will begin to froth and the ballon will blow up.
4.Carefully remove the inflated ballon,so that the gas does not escape.
5.Lower the ballon into a jar of limewater and release the gas.The limewater will turn milky.
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