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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 ...
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 ...
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.
Acrylic glass (plexiglass, hesalite glass): the most impact-resistant ("unbreakable" [46] [47]), and therefore used in dive watches and most military watches. Acrylic glass is the lowest cost of these materials, so it is used in practically all low-cost watches. Mineral crystal: a tempered glass. Sapphire-coated mineral crystal
Smartwatches are a hot-ticket gift over the holidays, but a new study might have you rethink how you strap the device to your wrist in the future. The study, which was just published in the ...
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The back patio has huge glass window/ doors that has a full view of the ocean & the woods. It's really beautiful during the day. During the night, however, it was f*****g scary.
Occasionally, a watch movement intended for a hunting case (with the winding stem at 3:00 and sub second dial at 6:00) will have an open-faced case. Such watch is known as a "sidewinder." Alternatively, such a watch movement may be fitted with a so-called conversion dial, which relocates the winding stem to 12:00 and the sub-second dial to 3:00.