Ivory Soap in the Microwave - Heat Makes Foam

Ivory Soap in the Microwave - Heat Makes Foam If you unwrap a bar of Ivoryâ„ ¢ soap and microwave it, the soap will expand into a foam that is more than six times the size of the original bar. Its a fun trick that wont hurt either your microwave or the soap. This soap trick can be used to demonstrate closed-cell foam formation, physical change, and Charles Law. Soap Trick Materials Bar of Ivoryâ„ ¢ soapPaper towel or microwave-safe dishMicrowave ovenOther brands of soap for comparison (optional) Perform the Soap Trick Unwrap a bar of Ivoryâ„ ¢ soap.Place the bar of soap on a paper towel or microwave-safe dish.Microwave your soap. Watch the soap closely to see what happens.Depending on microwave power, your soap will reach its maximum volume within 90 seconds to 2 minutes. If you microwave the soap longer (we  went up to 6 minutes) nothing bad will happen, but the soap wont continue to grow.Allow the soap to cool for a minute or two before touching it.The soap will feel brittle and flaky, but its still soap, with the same cleaning power as before. Go ahead and get it wet and youll see it lathers the same as ever. About Foams A foam is any material that traps a gas inside a cells of foams include shaving cream, whipped cream, Styrofoamâ„ ¢, and even bone. Foams can be fluid or solid, squishy or rigid. Many foams are polymers, but the type of molecule isnt what defines whether or not something is a foam. How the Soap Trick Works Two processes occur when you microwave the soap. First, you are heating the soap, which softens it. Second, you are heating the air and water trapped inside the soap, causing the water to vaporize and the air to expand. The expanding gasses push on the softened soap, causing it to expand and become a foam. Popping popcorn works in much the same way. When you microwave Ivoryâ„ ¢, the appearance of the soap is changed, but no chemical reaction occurs. This is an example of a physical change. It also demonstrates Charles Law, which states the volume of a gas increases with its temperature. The microwaves impart energy into the soap, water, and air molecules, causing them to move faster and further away from each other. The result is that the soap puffs up. Other brands of soap dont contain as much whipped air and simply melt in the microwave. Things to Try Place a bar of Ivoryâ„ ¢ in a bowl of water. Does it float? Try this with other brands of soap. Do they float or sink?Cut or break off a piece of Ivoryâ„ ¢ and examine it. Do you see pockets of air? The air that causes Ivoryâ„ ¢ to be less dense than water has been whipped into the soap, so you wont see bubbles or pockets of air. This is important because its the reason why the soap trick works.Try microwaving other brands of soap. Soap Trick Safety Dont leave the microwave unattended while microwaving soap.Dont place metal in the microwave.Be aware that while microwaving soap will not harm either your microwave or the soap, it will cause your microwave to smell floral and pretty for several hours.Wash your hands after playing with soap so that you dont accidentally eat it (though its not toxic) or get it in your eyes (which would burn).