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| Gravimeter
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(1) A device used to measure specific gravity, for example liquids. (2) Instrument that measures the gravitation pull of the earth at different places. |
| Gravity operated toilet
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A toilet that relies on the natural downward pressure of water in a toilet tank to flush the toilet effectively. |
| Gravity return condensate system
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A return system often used in steam heating which can use one set of pipes with a gravity return condensate system. Heated water turns to steam and rises through the pipes and into the radiators. After the steam cools, it condenses into water and drips back, through those same pipes, into the boiler. |
| Gravity warm air heating system
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Heating system, which circulates warm air through ducting using the rise of warm and the fall of cooler air, to heat a house. |
| Gray paper
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Backing paper on gypsum wallboard (drywall) panels or the paper on both sides of gypsum backing board panels. |
| Gray water
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Waste water from sinks, showers, and bathtubs, but not toilets. |
| Grease
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Any thick, oily substance or lubricant. |
| Grease gun
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| Grease interceptor or trap
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Trapping device, which keeps the grease in waste water from entering a sewer or septic system. |
| Grease trap
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A device that captures grease entering a system before it reaches the sewer lines. Usually used in commercial applications such as restaurants or cafeterias. |
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