. Elementary physics and chemistry: second stage . Fig. 52.—How to heat magnesium powder or ribbon in a crucible. The magnesium is seen to burn brightly in places, but, if care is taken, no fumes are lost. When finished, the whole mass should be in the form of a white powder. Allow to cool, and weigh the crucible with the lid and powder. Subtract the mass of the crucible and lid to find the mass of the powder. It will almost certainly be found to be more.

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