Learning Library

# Ivory Soap Experiment

### Problem:

Which soap will make the most foam: Dial or Ivory?

### Materials:

• 1 bar Ivory soap
• 1 bar Dial soap
• Paper plate
• Microwave
• Knife
• Measuring tape

### Procedure:

1. Measure both soaps’ length, width, and height.
2. Record the measurements of each.
3. Calculate the volume by multiplying the length, width and height together.
4. With the help of your adult lab assistant, cut the bars of soap into four equal pieces each.
5. Place two of the Ivory pieces on a paper plate.
6. Place the paper plate in the microwave for 2 minutes.
7. Watch what happens to the soap.
8. Remove from the microwave and take the same measurents you made in step 1.
10. Repeat steps 1-9 for Dial.

Before Microwaving

Dial

Ivory

Length (l)

Height (h)

Width (w)

Volume = l x w x h

After Microwaving

Dial

Ivory

Length (l)

Height (h)

Width (w)

Volume = l x w x h

### Results:

You should have discovered that the Ivory soap fluffed up bigger and created more foam than the Dial soap.

How do your results compare? Was your Ivory foam bigger than your Dial as it should have been? How much bigger was your bigger soap?

### Why?

During the Ivory soap experiment, the reason that the Ivory swells and creates more foam than the Dial soap is because Ivory is full of more air pockets than Dial is. Notice how the bar of soap itself seems to weigh less than other soaps. Microwaving softens the soap, then heats the water and air inside to expansion, causing the growth you saw.

### Digging Deeper

Science is a never-ending learning process. You can take this experiment so far and do so much with it. Try adding water to the resulting foam to see what you get. Try testing different microwaves to see which ones produced results more quickly. You can even test more soap brands to see which one starts to melt first. There are endless ways to extend this experiment. The only thing you need to remember is to record your results!

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