What are fuels ?
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What do you mean by an ignition temperature ?
Why does a phuljhari (sparking light) require some heating before it sparks ?
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Total mass of fuel = 4.5 kg Total heat produced = 180,000 kJTherefore,
Heat produce by burning 1 kg of fuel = 180,000 kJ/4.5 kg = 40,000 kJ/kg.
So, calorific value of fuel = 40,000 kJ/kg.