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Asked by Kalpana Last Modified
Answer 
CHEMICAL HARMONIUM ( Singing flame )
This experiment is based on the fact that when a flame, as of hydrogen gas or coal gas , burning within a tube is adjusted in such a way so as to set the air within the tube in vibration , it causes sound with different notes with changing levels of air column inside the tube.
HOW TO DO THIS :
Take some pieces of granulated zinc and put them into Woulfe’s bottle. Now add some dilute Sulphuric acid to this bottle using thistle funnel . Soon the hydrogen gas will start coming out of the delivery tube. Now ignite the hydrogen gas with the help of match stick .
The hydrogen gas will start burning with a blue flame. Now surround this flame with a glass tube about half an inch in diameter with both ends open. Now move the glass tube vertically up and down. A musical sound will be produced. You can set a musical tone just like harmonium d, by continuously moving the glass tube vertically up and down along the flame.
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