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| Acrylonitrile-butadiene-styrene (abs)
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Rigid black plastic pipe used for Drain, waste, and vent lines. |
| Activated alumina
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Chemical which is a form of aluminum oxide. It is used as a drier or desiccant. |
| Activated carbon
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Specially processed carbon used as a filter drier ; commonly used to clean air. |
| Active
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Will corrode in the presence of moisture or a "noble" metal. |
| Active cooling
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The use of mechanical heat pipes or pumps to transport heat by circulating heat transfer fluids. |
| Active power
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The power (in Watts) used by a device to produce useful work. Also called input power. |
| Active solar heating systems
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A solar water or space-heating system that use pumps or fans to circulate the heat-transfer fluid from the solar collectors to a storage tank subsystem. |
| Actual dimension
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The exact measurement of lumber after it has been cut, dried and milled. |
| Actuator
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That portion of a regulating valve which converts mechanical fluid, thermal energy or electrical energy into mechanical motion to open or close the valve seats. |
| Ad hoc
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Latin for the phrase, "for this". Meaning that it is used for the purpose at hand and not considered for a wider application. |
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