... textbook answers results, but I think that the percentage of heat that will be captured will be quite low. I think this because even if we place heat mats around the flame to stop most of the heat getting out some of it will, and it will not go to the boiling tube, which is where it needs to go. The glass of the boiling tube will resist some of the heat passing through to the water. This will vary due to the thickness of the glass tubes. Validity of Results To keep the results fair we should: * Keep the gap between the boiling tube and the burner the same distance away from each other, this will be 12cm. * Keep the amount of water the same, this will be 20cm3 * I will also use different boiling tube for each fuel burned. Method We will collect five or six spirit burners and weigh ...

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