What's The Use Of Crucible And Cover?


3 Answers

Connor Sephton Profile
Connor Sephton answered
A crucible is a ceramic container capable of withstanding extreme temperatures, whilst the cover is designed to prevent heat escaping from the crucible itself. Despite traditionally being made from clay, modern crucibles come in a range of material forms, including graphite, platinum and other inert heat-resistant metals. Basically, these containers can be made from pretty much any material that's capable of withstanding high temperatures for a prolonged period of time.

Crucibles are used for a range of purposes, and are particularly common amongst chemists for the chemical analysis of various substances. They are typically found in laboratories where various chemical compounds are heated, but can also be used to determine the ash content of burnable samples such as coal and wood. In general, reaction mixtures are heated in crucibles and purpose-built custom tongs must be used to handle the scorching hot materials contained in them. They are often considered dangerous because of their ability to cause fatal burns, and so it's of vital importance that they are used with great care and caution at all times, preferably under the supervision of a trained scientist.

Tracking the origins of the crucible and cover takes us back in time to the sixth or fifth millennium BC (Before Christ). At this point in time, crucibles were mainly used in Iran and other parts of the Eastern World in copper smelting and related processes. The use of the crucible and cover has changed quite dramatically over hundreds and thousands of years, with the Romans using the two objects for alloy production and the people of the Medieval era using them to smelt and melt other copper alloys such as lead.
Alice King Profile
Alice King answered
A crucible is a cup-shaped piece of laboratory equipment used to hold chemical compounds in small quantities when heating them to very extremely high temperatures. They are very durable and resist temperatures to over 1600°C. Historically, they have usually been made of clay, but they can be made of any material with a higher temperature resistance than the substances they are designed to hold.
Typically, a crucible will be placed into a furnace and, after the melting, the liquid metal is taken out of the furnace and poured into the mold. Some furnaces are designed so they have an embedded crucible and are tilted for when the metal is poured out.
Typically they are made of high temperature-resistant materials, usually porcelain but other metals such as nickel and zirconium have been used. The lids tend to be loose-fitting to allow gases to escape during heating of a sample inside. Crucibles and their lids can come in high form and low form shapes and in various sizes. Small size crucibles and their covers that are made of porcelain are relatively inexpensive and so sometimes disposed of after use in very precise quantitative chemical analysis.
Crucibles are used in;
Chemical Analysis
Ash content determination

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