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The crucible was weighted. then the mystery hydrogen was added, heated for about 15 seconds or basically to see if it melted in order to observe if the crucible would change from being a powder to a liquid.It was also weighed to see how the wieght changed when it was cooled and when it was heated. The mystery hydrogen went from one crucible to another and repeated twice to get the cooled weight of both the crucible and the mystery hydrogen.