Sun October 21, 2012 By: Shivansh Verma

when we drop a thermocol from a height it do not produces a sound but when we burn some part of it and drop from the same height it produces a sharp sound . is there any change in the structure of ato of thermocol that cause it to produce sound ?

Expert Reply
Tue October 23, 2012
After heating there occur a chemical reaction so sound produced .
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