ivory soap science project

Simple Kids Science Fair Project Idea

You can use Charles Law to show a physical change in a normal bar of soap Ivory.

Charles Act stipulates that the base material has a constant pressure gas and the temperature increases so will the gas and if a bar of soap is made of foam this should cause the foam to increase in size as it is made of molecules of cell-based gas and bigger.

Let's look at this before proceeding.

Soap is a foam. The foam can be any material that is gas trapped within it, something like small bubbles. You can not think of soap as a foam, as it is solid and hard but foam can come in many forms and can be solid, hard or soft and spongy. You probably think of whipped cream as a foam, and foam that is used to shave.

We test the temperature rise in a bar of soap Ivory to see if the gas inside the foam will cause the soap to expand and make a physical change.

Here is what we need.

1. A bar Ivory Soap

2. A paper plate

3. Another bar of soap, no Ivory

Now unwrap the Ivory soap and place on paper plate.

Microwave the soap and watch closely while cooking to see what happens.

Your soap should finish cooking 1-2 minutes. All this depends on the temperature of your microwave. If cooked too long the soap will not get bigger.

Allow the soap to cool before removing or touching. You may want a parent to help you with this so that no one is burned.

After the soap is cool touch it and examine it. Soap is flaky and hard. It is still soap and you can wash your hands with some of the flakes.

Why this job?

Well, when you cook the soap making it is smooth and boiling water and beat the gas inside the soap. When the water boils and evaporates as it is heated it expands. When the water becomes in gas expands and this causes the soft soap to expand too, and now really does look like a mousse.

When cooking the soap is not a physical change but no chemical change. It is still soap. This is why Charles Law is shown because the volume of gas will increase with increasing temperature. The microwave oven excite the energy molecules in the soap and make it move very fast and when they do move away from each other as they bounce each other.

If you try another brand of soap, you will probably find a few puffs but basically melts because many other soaps do not contain the same amount of air. I do not recommend cooking another kind of soap as some have many of the perfumes that have strong odors while cooking.

This is why a bar of Ivory soap will float in comparison with other brands of soap. Air has more riding on its preparation and as a child with a float in the arms filled with air that causes them to float in a pool, a bar of Ivory soap will float because it has a lot of air inside. Try another brand of soap see if they float. Now cut the Ivory soap in half and look at it. Do you see the little holes of air? Look at another bar of soap after cutting in half.

By doing this science project:

1. Stay in the microwave and do not leave.

2. Do not put metal items in the microwave

3. This will not hurt your microwave or the soap. You can still use the soap when done.

4. You will notice a smell of soap, as it cooking. This will make your microwave smell fresh and flowery for a few hours. Only use Ivory soap.

Here is the formula Charles Law

where:

V is the volume of gas

T is the temperature of gas (measured in degrees Kelvin)

k is a constant.

Vo V = (1 + a?)

Therefore, with increasing temperature, the volume of gas increases.

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About the Author

hi, I am shaikh saddam from Mumbai.

Science Experiment for 8 yr old – Ivory Soap and the Microwave