Precious metals and gems are measured in troy weights in the English system. The following conversion factors are all considered exact.  24 grains= 1 pennyweight 20 pennyweights= 1 troy ounce 12 troy ounces= 1 troy pound 1 grain= 0.0648g 1 carat= 0.200g 1 pound avoirdupois= 453.6 g The density of platninum is 21.45 g/cm 3. What is the volume of one pennyweight of platinum?

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Matter and Measurement

In the universe, there is matter, energy, and void space. The universe contains energy and void space. The definition of matter can be considered as something which possesses mass and consumes space. Chemistry is that branch of science which deals with the study of matter. Under chemistry, nature, composition, and the changes occurring to matter are discussed.