Normally you blow a balloon with your mouth. However it is great fun to blow a balloon inside a bottle. Make a small hole in the cylindrical surface near the base in a 2-litre bottle. Glue a piece of stiff straw in the hole. Push a balloon inside the bottle and stretch it on the mouth of the bottle. On sucking through the straw the balloon will be inflated. Close the straw end and the balloon will remain inflated.
http://www.arvindguptatoys.com/toys/ballooninbottle.html This work was supported by IUCAA and
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