Method
I must make sure that I am safe during the whole experiment. To do this I must be very careful when using the hot water out of the water bath.
I am going to make my experiment fair by keeping the temperature of the water from the water bath the same, the amount of the water the same. The amount of area covered by the paper towel. I will make sure not to take the thermometer out of the boiling tube when taking the temperature. I will make sure to start the stop clock as soon as all the water is poured in to the boiling tube. I will take the temperature exactly every 30 seconds. The amount of water used on the wet paper towel for when I repeat the experiment. Repeat the experiment and take averages.
Firstly I will wet one of the paper towels with 50ml of water. I will then wrap it around one of the boiling tubes and attach it with 2 elastic bands.
I will do the same for the other boiling tube but not wet the paper towel at all.
Then I will attach them both on the clamp stands. Then I will put a thermometer in them both.
Then I will then measure out 35ml of hot water from the water bath using a 50ml measuring cylinder. Then I will pour this water into the boiling tube wrapped in the wet paper towel. I will immediately start the stop clocks as all the water has been poured into the boiling tube. Then every 30 seconds I will take a reading of the temperature. When then temperature stops decreasing I will pour away the water.
I will do all this again but for the boiling tube wrapped in the dry paper towel.
When the temperature stops decreasing for this boiling tube I will repeat the whole experiment again and work out the averages.
Diagrams
Results
Analysis
I have found out that the boiling tube wrapped in a wet paper towel cooled down the quickest. I have found only on pattern in my results and that is that as time increases the temperature falls. I have found that my prediction was correct because I said that the boiling tube wrapped in a wet paper towel will cool down quicker than the boiling tube wrapped in the dry paper towel. I know that my prediction was correct because on my graph at every 30 seconds the temperature of the boiling tube wrapped in the wet paper towel was lower than the paper towel wrapped in the dry paper towel. For example after 150 seconds the temperature of the boiling tube wrapped in a wet paper towel was 42.5°C where as for the boiling tube wrapped in a dry paper towel the temperature was 49.5°C.
This has happened because the heat of the water is absorbed into the water and is then the water is evaporated away with the heat in it.
Evaluation
The most inaccurate parts of my experiment are the temperature of the water when it is taken from the water bath because the temperature will dropped from when I used for the boiling tube wrapped in a wet paper towel to when I used it for the boiling tube wrapped a dry paper towel. I could have stopped this by putting the lid of the water bath back on. This would have stopped heat loss and the starting temperature would have been the same every time.
The amount of water used from the water bath could have been more accurate by using a volumetric pipette this would have measured out exactly the right amount of water.
I could also take the temperature more accurately and at exactly every 30 seconds. To do this I could use and electronic thermometer
I don’t think that I would have changed my method I would just have used different apparatus which I have mentioned above to make my experiment more accurate.
I don’t think that any of my results where very inaccurate because they all follow the same general patter as time increases the temperature decreases. But they could have been more accurate as I have stated above.
I think that my results are accurate enough to make a good conclusion because my test was very fair I did the entire thing I stated in my plan although they could have been improved to make my experiment more fair and accurate.
