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Most evaporating dishes are made of porcelain or borosilicate glass. [1] Shallow glass evaporating dishes are commonly termed "watch glasses", since they resemble the front window of a pocket watch. [b] Some used for high-temperature work are of refractory metals, usually of platinum, owing to its non-reactive behaviour and low risk of ...
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 ...
Glass evaporating dishes, such as watch glasses, are primarily used as an evaporating surface (though they may be used to cover a beaker.) The Petri dish is a flat dish filled with a nutritious gelatin that allows for microorganisms to quickly grow, its named after its inventor Julius Petri in the 1880s.
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.
Productive vs. nonproductive cough. You can further drill a cough down into a productive or nonproductive cough. “A productive cough is a cough that produces phlegm,” Dr. Youssef says.
Classic Beef Stroganoff. A nod to tradition, with a tip of the hat to the ’80s love of decadent meals, beef Stroganoff seemed destined for popularity.
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The presence of a spout means that the beaker cannot have a lid. However, when in use, beakers may be covered by a watch glass to prevent contamination or loss of the contents, but allowing venting via the spout. Alternatively, a beaker may be covered with another larger beaker that has been inverted, though a watch glass is preferable.