Physical science is the study of the physical world around you. Learn about everything from electricity to magnetism in this section.
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Microwaves, extremely short radio waves. The term is usually used to refer to radio waves with a wavelength between 30 centimeters and 3 millimeters—that is, with a frequency between 1 gigahertz (billion hertz) and 100 gigahertz.

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Chemical Reactions

Life depends on chemical reactions to run. Whether you’re making some home brew or sitting in a car with an internal combustion engine, chemical reactions power the world. Sometimes, though, they can cause unexpected health issues.

How Acoustic Levitation Works

The idea that something so intangible can lift objects can seem unbelievable, but it's a real phenomenon. Learn how acoustic levitation takes advantage of the properties of sound to cause solids, liquids and heavy gases to float.

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