The insulating properties of fabric
The materials required for this science project::
- 3 conical flasks
- 3 corks
- 1 electric drill with the bits
- 3 thermometers
- 1 scarf made from Thinsulate fabric
- 1 scarf made from cotton fleece
- 2 strings
- Tap water
- 1 hot plate
- 1 clock
1. For this science project, the independent variable is the type of fabric used to insulate the flask – air, Thinsulate scarf or cotton fleece scarf. The dependent variable is the temperature of the water in the conical flask. This is determined by using the thermometer to measure the temperature. The constants (control variables) are the size of the conical flask, the amount of water in the flask and the room temperature.
2. A hole is made in the middle of the 3 corks using the electric drill. The diameter of the hole should be almost the same as the diameter of the thermometer. The thermometers are then inserted into the corks.
3. Three conical flasks are filled with tap water. The cork with the thermometer inserted is used to cover the top of the conical flask. The height of the thermometer is adjusted so that the bottom tip of the thermometer will touch the water inside the flask. Next, the 3 flasks are placed on the hot plate and heated up until the temperature of the water inside reaches 50 C.
4. The first conical flask will be the control and will not have any fabric covering it. The second conical flask is wrapped with the Thinsulate scarf while the 3rd conical flask is wrapped with the cotton fleece scarf. Strings are used to tie the scarf to the flask.
5. The time on the clock is taken and the 1st temperature readings are taken from the 3 thermometers and recorded in the table given below. The temperatures are taken from the 3 thermometers every 30 minutes for the next 2 hours and recorded in the table given below.
Handle hot water carefully. Adult assistance is required.