Investigating Surfaces for Insulating Boiling Water in a Flask
Aim
I'm investigating which surface (matt black or silvery) is best at
insulating boiling water. I will investigate this by covering two
equally sized conical flasks in different materials; one in matt black
and one in silvery. After that I will fill each of the flasks with an
equal amount of boiling water. At regular intervals of 1 minute I will
measure the drop in water temperature in each flask.
Prediction
I predict that the flask with the silvery surface will take longer to
cool and overall there will be a smaller drop in temperature because
the silver surface will reflect nearly all heat radiation back into
the flask keeping the water warm whilst a dull black surface is a very
good emitter of heat radiation so a lot of heat will be lost to the
surroundings.
Method
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Apparatus
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* Conical flasks
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-One silver foil
-One matt black
* 2 Thermometers
* Cotton wool
* Stopwatch
* 400cm³ Boiling Water *
* Measuring jug
For the experiment, firstly get 2 equally sized conical flasks. Then
cover one of the flasks in matt black and one in silvery foil.
Secondly, boil 400cm³ (*possibly more as water can evaporate) of water
and put exactly 200cm³ in each flask. Then put a thermometer in each
of the conical flasks, and fill the top with cotton wool; this is to
insulate the flask thoroughly and stop water evaporating through the
top part of the flask. The thermometers have to be left to settle
before taking the first reading at zero minutes. After that at 1minute
intervals, read each thermometer and record the temperature. Repeat
this 3 times, so the test is fair and more precise. Afterwards, work
out the average for each reading. For Safety hand gloves should be
worn for handling hot water. Also make sure that the flasks containing
An Investigation Into How the Thickness of Insulation Affects the Time a Drink Takes to Cool Down
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