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How do you calculate Volatile matter present in coal?

 How do you calculate Volatile matter present in coal?

Ans. 
Take 2 gram of moisture free coal sample & keep it in mufle furnace for 7 minutes at 900 deg C temperature. Then cool it in desiccator for 15 minutes. Then sample is again weighed for final weight.

Volatile matter Loss in weight X 100/Weight of the sample (2 gram)

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