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Long answer the following question:
You are provided with three watch glasses containing milk, petrol and mustard oil, respectively. Suppose you bring a burning candle near these materials one by one, which material(s) will catch fire instantly and why?
The watch glass having will catch fire immediately because its ignition temperature is . Also, petrol is a flammable substance, i.e. it can readily capture fire with a flame. Its calorific value is 45.8 MJ/kg. This is significantly when compared to milk or mustard oil.
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