any base or hydroxide that is soluble in water, neutralizes acids and forms salts with them, and turns red litmus blue. Sometimes differentiated as mild — sodium, potassium, ammonium, etc., and caustic corresponding hydroxides.
the name of a group of organic or inorganic compounds with common characteristics. One of the characteristics is that it will ionize in water to produce hydrogen ions. Turns blue litmus red. Inorganic acids are used in producing metals, plastics, explosives, and dyes
a measuring instrument having two legs or jaws that can be adjusted to determine thickness, diameter caliber and distance between surfaces.
the sand, grit, and other coarse material removed by differential sedimentation in a relatively short period of detention.
a fixture designed to wash bedpans and to flush the contents into the soil drainage system. It may also provide for steaming the utensils with steam or hot water.
the lowest portion of the inside top surface of the channel through the trap.
a device to seal against entry of sewer airs having its shape resemble an inflated bag.