Viscosity of sweetened water
The materials required for this science fair project:
- 1 metal cup (>200ml)
- An electric drill with a small drill bit
- 1000ml distilled water
- 300 grams of sugar
- A measurement cylinder
- A digital weighing scale
- 5 beakers
- A stopwatch
- A spatula
- A black marker pen
1. For this science fair project, the independent variable is the amount of sugar added to the water i.e. 20g, 40g, 60g, 80g and 100g. The dependent variable is the viscosity of the solution. This is determined by using a stopwatch to measure the rate of flow of the solution. The constants (control variables) are the size of the hole in the cup and the volume of the cup.
2. Using an electric drill, a small hole is created at the bottom of the metal cup.
3. The beakers are labeled “20g”, “40g”, “60g”, “80g” and “100g”. Using the measuring cylinder, 200ml of distilled water is poured into each of the 5 beakers.
4. The digital weighing scale is used to measure 20g, 40g, 60g, 80g and 100g batches of sugar and they are added into the beakers according to their markings. The spatula is used to mix the solution.
5. The metal cup is held up and the hole at the bottom of the metal cup is covered with 1 finger. The contents of the beaker marked “20g” is poured into the metal cup. The finger is removed from the hole and the stopwatch is immediately activated. The time taken for the cup to empty is measured and the results recorded in the table below.
6. Procedure 5 is repeated with the beakers labeled “40g”, “60g”, “80g” and “100g”.
Be extremely careful when handling tools, especially power tools. The assistance of an adult is required for this.