RANDHAWA GLOBAL High Temperature Resistant Watch Glass 5 inch Diameter, RG-88097 (Pack of 2 Pcs)

RANDHAWA GLOBAL High Temperature Resistant Watch Glass 6 inch Diameter, RG-88097 (Pack of 2 Pcs) is a simple, circular, and flat piece of laboratory glassware, typically made of clear glass or borosilicate glass. It is often used as a versatile tool in laboratory settings for various purposes. While it is called a "watch" glass, it has no direct relation to timekeeping; instead, it is named for its resemblance to the glass face of a pocket watch.

Key features and functions of a watch glass:

Cover or Evaporation Dish: Watch glasses are primarily used as covers for beakers, flasks, or other containers during laboratory experiments. They serve as lids to prevent contamination, evaporation, or splattering of contents. When placed upside down over a container, they protect the contents while still allowing observation.

Evaporation: Watch glasses are employed for evaporating small quantities of liquids, especially when concentrating solutions or precipitating solids. The wide, flat surface area allows for efficient evaporation while preventing contamination from airborne particles.

Crystallization: Watch glasses are used to facilitate crystallization processes. When a solution is left to evaporate on a watch glass, it often results in the formation of crystalline solids. The flat surface provides an ideal platform for crystal growth.

Sample Inspection: Watch glasses can be used as small, shallow containers for examining and inspecting samples, such as particulate matter, small organisms, or crystals. They offer a clear view and prevent spillage or contamination.

Weighing: In analytical chemistry, watch glasses are used as weighing dishes for measuring and transferring small quantities of substances on a balance. They are particularly useful when the substance's mass must be accurately determined.

Cover for Heated Samples: When heating substances in a crucible or test tube, a watch glass can be used as a cover to prevent loss of sample due to splattering or to contain any volatile components.

Containment of Small Reactions: Watch glasses are sometimes used as small reaction vessels for qualitative tests or microscale reactions.

Watch glasses come in various sizes, with diameters ranging from a few centimeters to over 15 centimeters, depending on the intended application. They are relatively inexpensive and easy to clean, making them a versatile and cost-effective tool in laboratory work.

In summary, a watch glass is a multipurpose laboratory tool commonly used as a cover, evaporating dish, crystallization surface, or container for small-scale experiments. Its versatility and simplicity make it an essential part of laboratory equipment, aiding in various processes and experiments across different scientific disciplines.

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