![]() ![]() We'll look at how sound waves become capable of lifting objects in the next section. The process relies on of the properties of sound waves, especially intense sound waves. In space, it can hold objects steady so they don't move or drift. On Earth, this can cause objects and materials to hover unsupported in the air. You can watch the following animation to learn more about the basics of sound.Īcoustic levitation uses sound traveling through a fluid - usually a gas - to balance the force of gravity. Without this movement of molecules, the sound could not travel, which is why there is no sound in a vacuum. Each molecule moves the one next to it in turn. The sound wave travels as the moving molecules push and pull the molecules around them. Each repetition is one wavelength of the sound wave. #SIMPLE MATH ACOUSTIC SERIES#The bell then repeats the process, creating a repeating series of compressions and rarefactions. As the side of the bell moves back in, it pulls the molecules apart, creating a lower-pressure region called a rarefaction. This area of higher pressure is a compression. As one side of the bell moves out, it pushes the air molecules next to it, increasing the pressure in that region of the air. For example, if you strike a bell, the bell vibrates in the air. A sound's source is an object that moves or changes shape very rapidly. Third, sound is a vibration that travels through a medium, like a gas, a liquid or a solid object. The particles in gasses, like the ones that make up air, are simply farther apart and move faster than the particles in liquids. ![]() Air also moves like water does - in fact, some aerodynamic tests take place underwater instead of in the air. Like liquids, air is made of microscopic particles that move in relation to one another. Second, air is a fluid that behaves essentially the same way liquids do. Scientists haven't decided exactly what causes this attraction, but they believe it exists everywhere in the universe. An enormous object, like the Earth, easily attracts objects that are close to it, like apples hanging from trees. The closer objects are, the more strongly they attract each other. The more massive an object is, the more strongly it attracts other objects. This law states that every particle in the universe attracts every other particle. The simplest way to understand gravity is through Isaac Newton's law of universal gravitation. ![]() First, gravity is a force that causes objects to attract one another. To understand how acoustic levitation works, you first need to know a little about gravity, air and sound. ![]()
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