My PBL Project

MATERIALS:

• Wire hangers

• Bucket

• Water (1 gallon)

• Dishwashing liquid (1/2 cup)

• Glycerin (1/4 cup)

• Measuring Cup

• Large spoon

• Yarn (optional)

PROCEDURE

1. Prepare the bubble solution. Fill the bucket with a gallon of water. Pour in the glycerin and dishwashing liquid. Mix with a large spoon.

2. Let the solution sit for at least a day, preferably longer. With an increasing length of time, there is an increasing strength in the bubbles.

3. Form wire shapes (circle, square, cube, rectangular prism, pyramid, etc.) with the hangers. Make sure to form a handle to hold the shapes. The shapes should be of an acceptable size to fit in the bucket.

4. Optional: Tightly wrap yarn around the wires for better absorption of the solution.

5. Dip the various shapes into the solution and then take them out. Observe the result.

SCIENTIFIC PRINCIPLE

• • My PBL project basically deals with the properties of water. One of these properties is surface tension, which describes how difficult it is to break or stretch a liquid’s surface. This property results from the attraction of water molecules to each other.

Safety Regulations

• No safety regulations needed.