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| Sight hole
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Generally a window on oil-fired products that allows the viewing of burner and flame patterns. |
| Sight line
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Visible area that can be readily seen by outside traffic and is very important for a commercial business. |
| Sigma heat
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The sum of sensible heat and latent heat in a substance above a base temperature, typically 32 degrees Fahrenheit. |
| Sign anchor
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A component usually formed with steel angles which penetrates the BUR and is fastened to the deck. |
| Signal
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(1) A sign given by gesture, red flag, flashing lights, warning sound, etc. used to convey a command, direction, warning, etc. (2) A sign, understood to be the occasion for a prearranged combined action. (3) Indicator which gives an alert that a device is in operation. |
| Silent partner
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Partner who remains anonymous but has legal rights and obligations. |
| Silica
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A hard glassy material found in quartz, sand, opal, which is often used in the manufacture of a variety of refractory brick. |
| Silica gel
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Moisture absorbing compound used to absorb unwanted moisture |
| Silicon
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A non-metallic chemical element, occurring in several forms and found always in combination and more abundant in nature than any other element except oxygen, with which it combines to for silica, and which makes up more than 25 percent of the earth's crust. It is used in the manufacture of solar cells, transistors, silicones, semi-conductors, ceramics, etc. Symbol, Si. Atomic number 14. Atomic weight, 28.086. |
| Silicon bronze conduit
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Silicon bronze, corrosion resistant conduit. |
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