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crucible
A crucible is a cup-shape piece of laboratory equipment used to contain chemical compounds when heating them to very high temperatures. Crucibles are available in several sizes and typically come with a crucible cover (or lid).
Trivia about crucible
The container Arthur Miller would use to heat substances to a high temperature, or his 1953 play
(Jimmy of the Clue Crew visits a training course at Parris Island, SC.) 10 weeks into training, recruits undergo this endurance test, hauling 54 lbs. of gear; it's named for a metal melting vessel