a chemical compound so imperfectly bound together that its composition will change in accordance with the concentration of chemicals in the solution in its presence. Advertisements
a soft, silver white, metallic chemical element occurring only in compounds. Sodium is of the alkali metals which oxidizes rapidly in the presence of air and reacts violently with water ( stored under kerosine).
a brittle grayish- white metal with a pink or red tint. Pure bismuth is harder than lead and melts at 520 °F. Also used with lead, tin, or iron to make alloys used for fusible bulbs and safety plugs for automatic sprinkler systems and boiler plugs. Bismuth is used chiefly in the formation of alloys […]
1. a substance used to promote fusion, especially of metals or minerals. 2. a substance (as rosin) applied to surfaces to be joined to clean and face them from oxide and promote their union.
1. to confine a potential source of contamination to the non-potable system being served 2. to provide a backflow prevention mechanism at each actual or potential cross-connections.
a relatively soft material used in making joints watertight or airtight by being squeezed or compressed in the joining operation