A crucible's a heat-resistant container in which materials can be heated to very high temperatures. The use of crucibles to manufacture Crucible steel, introduced in England in the eighteenth century, was an important part of the Industrial Revolution. Laboratory crucibles A crucible's a cup-shaped piece of laboratory equipment used to contain chemical compounds when heated to extremely high temperatures. Crucibles are available in several sizes and typically come with a correspondingly-sized c… (More on Crucible)