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compressor| Machine that compresses a gas, usually air, commonly used to power pneumatic tools, such as road drills, paint sprayers, and dentist's drills. Compressed air expands when the pressure is removed, thus supplying the power to drive the tool. |
| Compressors are grouped into either positive displacement machines (which use a mechanical means of compression) or dynamic machines (which produce compression by creating high air speeds and thus high levels of kinetic energy, which is then converted into static pressure by a diffuser). |
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