The space between magnetic poles, or between the rotating and stationary assemblies in a motor or generator.
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WATER COLUMNA vertical tubular member connected at its top and bottom to the steam and water space respectively to a boiler, to which the water gage, gage valves, high and low water alarms and fuel cutoff may be connected. |
POHLE AIR LIFT PUMP
A pistonless pump in which compressed air fills the annular space surrounding the uptake pipe and is free to enter the rising column at all points of its pressure but sometimes welded or bonded.
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PLENUM CHAMBER
An enclosed space in which a plenum condition exists; air is forced into it for slow distribution through ducts.
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PERMITTIVITY
The dielectric constant multiplied by the permittivity of empty space, where the permittivity of empty space (0) is a constant appearing in Coulomb's law, having the value of 1 in centimeter-gram-second electrostatic units, and of 8.854 10 12 farad/meter in rationalized meter-kilogram-second units.
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PAVEMENT LIGHT
A window built into the surface of a pavement to admit daylight to a space below ground level.
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PANEL COOLING
A system in which the heat-absorbing units are in the ceiling, floor, or wall panels of the space which is to be cooled.
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NEGATIVE POTENTIAL
An electrostatic potential which is lower than that of the ground, or of some conductor or point in space that is arbitrarily assigned to have zero potential.
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MULTICHANNEL FIELD-EFFECT TRANSISTOR
A field-effect transistor in which appropriate voltages are applied to the gate to control the space within the current flow channels.
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MOIST ROOM
An enclosed space that is maintained at a specified temperature, usually 73 F (23 C), with the humidity maintained at 98% or above and that is used to cure and store test specimens of cementitious material.
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MIXING CHAMBER
The space in a welding torch in which the gases are mixed.
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