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  2. Watch glass - Wikipedia

    en.wikipedia.org/wiki/Watch_glass

    A watch glass is a circular concave piece of glass used in chemistry as a surface to evaporate a liquid, to hold solids while being weighed, for heating a small amount of substance, and as a cover for a beaker. When used to cover beakers, the purpose is generally to prevent dust or other particles from entering the beaker; the watch glass does ...

  3. Evaporating dish - Wikipedia

    en.wikipedia.org/wiki/Evaporating_dish

    An evaporating dish is a piece of laboratory glassware used for the evaporation of solutions and supernatant liquids, [a] and sometimes to their melting point.Evaporating dishes are used to evaporate excess solvents – most commonly water – to produce a concentrated solution or a solid precipitate of the dissolved substance.

  4. Syracuse dish - Wikipedia

    en.wikipedia.org/wiki/Syracuse_dish

    A Syracuse dish or Syracuse watch glass is a shallow, circular, flat-bottomed dish of thick glass. Usually, it is 67 mm in outer diameter and 52 mm in inner diameter. Usually, it is 67 mm in outer diameter and 52 mm in inner diameter.

  5. Beaker (laboratory equipment) - Wikipedia

    en.wikipedia.org/wiki/Beaker_(laboratory_equipment)

    In laboratory equipment, a beaker is generally a cylindrical container with a flat bottom. [1] Most also have a small spout (or "beak") to aid pouring, as shown in the picture. Beakers are available in a wide range of sizes, from one milliliter up to several liters. A beaker is distinguished from a flask by having straight rather than sloping ...

  6. Wire gauze - Wikipedia

    en.wikipedia.org/wiki/Wire_gauze

    Glassware has to be flat-bottomed if rested on the wire gauze. [ 3 ] Wire gauze was also used in safety lamps containing a flame in coal mines and environments where flammable gases may build up; the gauze prevents the flame from igniting gas outside the lamp, causing an explosion.

  7. Wash bottle - Wikipedia

    en.wikipedia.org/wiki/Wash_bottle

    A wash bottle is a squeeze bottle with a nozzle, used to rinse various pieces of laboratory glassware, such as test tubes and round bottom flasks. Wash bottles are sealed with a screw-top lid. When hand pressure is applied to the bottle, the liquid inside becomes pressurized and is forced out of the nozzle into a narrow stream of liquid.

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    mail.aol.com

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  9. Test tube - Wikipedia

    en.wikipedia.org/wiki/Test_tube

    A test tube, also known as a culture tube or sample tube, is a common piece of laboratory glassware consisting of a finger-like length of glass or clear plastic tubing, open at the top and closed at the bottom. Test tubes are usually placed in special-purpose racks.