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www.reference.com/article/air-fluid-7b45a1c4388ed4a5

Although fluid is sometimes used as an alternative word for liquid, air is treated as a fluid in the field of fluid mechanics. Objects moving through air encounter forces and experience conditions similar to objects traveling through liquids.

www.reference.com/article/audio-communication-d4505958c3caa7fd

Audio communication is any form of transmission that is based on hearing. Audio communicative forms are found in such platforms as audio books, television, movie soundtracks and music records.

www.reference.com/article/types-audio-systems-b7dc6917ae0db833

Some types of audio systems include Hi-Fi music systems, wireless music systems and MP3 docking systems. Other examples include home theater systems, portable music systems, and CD or radio cassette players.

www.reference.com/article/audio-converter-fbed78130ec9f9d4

An audio converter is hardware or software capable of decoding or encoding a digital data stream of audio. Analog-to-digital converters receive a continuous signal, usually voltage, and convert it into a digital number to estimate its amplitude.

www.reference.com/article/audio-equalizers-work-4beb9a541cdcacd7

An audio equalizer, or EQ, alters sound by adding to or reducing frequencies within a signal. Treble and bass controls on audio equipment are two types of equalizers that adjust high and low frequencies, respectively.

www.reference.com/article/fluid-pressure-6b535109b8587c7d

According to Reference.com, "fluid pressure" is defined as the pressure exerted by a fluid at a given depth. The weight of the liquid acting on a unit area combined with pressure acting on the surface of the liquid determines the amount of liquid pressure.

www.reference.com/article/air-considered-fluid-f29c033851ea7819

Air is a fluid because the force needed to deform it depends on how fast it is deformed, not on how much it is deformed. This differs from a solid, where the force needed to deform it remains the same whether it is done quickly or slowly.