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How are death masks made?

May 11, 2017 | Author: | Posted in General Knowledge

A death mask is made by applying some kind of plaster, such as plaster of Paris, to the face after the skin has been treated with oil to prevent the plaster from adhering too closely. After the plaster has hardened it is removed, and into the mold thus formed fresh plaster or some other material …

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What is the lightest substance known?

March 11, 2017 | Author: | Posted in Science

The element hydrogen is the lightest substance known to science. Its specific gravity, compared to air, is 0.0695. Helium, with a specific gravity of 0.139, is the next lightest substance. Specific gravity is relative density, that is, the ratio of the weight of any volume of a substance to the weight of an equal volume …

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