To measure heat loss in two test tubes which represent bodies, one which sweats (the wet test tube) and one body which doesn't sweat (the dry test tube).

Plan: Preliminary Experiment.

1. I started by setting up my apparatus as it’s shown in the diagram above.
2. I then boiled some water in a kettle.
3. After the water had boiled I measured out 25cm3 of water in two measuring cylinders and then pouring into each boiling tube.
4. I then began taking readings for 20 minutes, every minute and recorded them.
5. My preliminary experiment wasn’t as successful as possible because the starting temperatures of each boiling tube were not the same. This was because the wet paper towelling around one of the boiling tubes had already cooled the boiling tube so when I pored the water in it cooled very rapidly.

Results:

Calculations:

The dry boiling tube cooled by 20OC, and the wet boiling tube cooled by 35OC.

The wet boiling tube cooled 22OC more than the dry boiling tube.  

Plan: Experiment 2.

1. I decided to test each boiling tube separately.
2. I did this by pouring 25cm3 of boiling water in to a boiling tube covered in a wet paper towel and the taking the readings for 10 minutes because the most significant change in temperature occurs between 0 and 10 minutes in my preliminary experiment.
3. I then poured some more boiling water into a boiling tube covered by a dry paper towel. I waited for the temperature to drop so the starting temperature was the same as the starting temperature for the wet test tube.
4. I then took readings of this boiling tube for 10 minutes.

Results:

 

Calculations:

The dry boiling tube cooled by 12OC, and the wet boiling tube cooled by 30OC.

The wet boiling tube cooled 18OC more than the dry boiling tube.  

Plan: Experiment 3.

1. I decided use a stopper at the top of the boiling tube to plug it up.
2. I did this by pouring 25cm3 of boiling water in to a boiling tube covered in a wet paper towel and then poured 25cm3 of boiling water into a boiling tube covered by a dry paper towel. At this point, the temperatures were not the same, so I blew on the top of the water in the boiling tube covered in the dry paper towel to bring the temperature down.
3. I then took readings of this boiling tube for 10 minutes.

Results.

Calculations:

The dry boiling tube cooled by 17OC, and the wet boiling tube cooled by 26OC.

The wet boiling tube cooled 9OC more than the dry boiling tube.  

Plan Experiment 4.

1. The plan for experiment was exactly the same as experiment 3 except I used cotton wool to plug up the boiling tube instead of using a stopper.

Results:

Calculations:

The dry boiling tube cooled by 11OC, and the wet boiling tube cooled by 25OC.

The wet boiling tube cooled 14OC more than the dry boiling tube.  

Plan Experiment 5.

1. For this experiment I decided to cover the boiling tubes in dry paper towels and then pour 25cm3 of boiling water in to each boiling tube.
2. I then made sure that the temperature of the water was the same for both boiling tubes and took my first reading for 0 mins.
3. I then wet one of the boiling tubes, and took my second reading a minutes later.

Results:

Calculations:

The dry boiling tube cooled by 10OC, and the wet boiling tube cooled by 26OC.

The wet boiling tube cooled 16OC more than the dry boiling tube.  

Plan Experiment 6.

1. I did this experiment in exactly the same way I did experiment 5 because I thought that this was the most accurate method, so I wanted to make sure my results were accurate.

Results:

Calculations:

The dry boiling tube cooled by 11OC, and the wet boiling tube cooled by 25OC.

The wet boiling tube cooled 14OC more than the dry boiling tube.