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Q9. Petroleum vapours are dangerous substances and when mixed with air can be ignited.
i) sketch an explosimeter or combustion gas indicator which can be used to check the atmosphere of a tank or pumproom. (5)
ii) describe the explosimeter and its operation (5)
iii) state one reason that may cause the explosimeter to give a false reading
b) for flammable mixtures, explain the meaning of the terms lower and upper flammable limits (6)