By St. John C.E.
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Extra resources for Elements in the Sun
One atmosphere is equal to 760 torr. The Nature When of a Liquid iodine crystals are heated to 114°C they melt, forming liquid The temperature at which the crystals and the liquid are in equiwhich there is no tendency for the crystals to melt or for the liquid to freeze— is called the melting point of the crystals, and the freezing point of the liquid. This temperature is 1 14°C for iodine. Liquid iodine differs from solid iodine (crystals) mainly in its fluidity. 2 cm 3 but it does not have a definite shape; instead, it fits itself to the shape of the bottom part of its container.
The Electron^ the Nuclei of Atoms, and the Photon 40 3-1. The Nature [Chap. 3] of Electricity The ancient Greeks knew that when a piece of amber is rubbed with wool or fur it achieves the power of attracting light objects, such as feathers or bits of straw. The phenomenon was studied by William Gilbert (15401603), Queen Elizabeth Fs physician, who invented the adjective electric to describe the force of attraction, after the Greek word elektron, meaning amber. Gilbert and many other scientists, including Benjamin Franklin (1706-1790), investigated electric phenomena, and during the nineteenth century many discoveries were made about the nature of electricity and of magnetism (which is closely related to electricity).
Particles of such as the cubic Sometimes these single crystals are very large; occasionally crystals of minerals several meters in diameter are found in nature. In our discussion we an example. Crystals of copper on edge, as shown in Figure 2-1, are found in shall use copper as as large as a centimeter The Description of a Crystal Structure [2-5] deposits of copper ore. An 21 ordinary piece of the metal copper does not consist of a single crystal of copper, but of an aggregate of crystals. The specimen of a metal can be made clearly visible by polishing the surface of the metal, and then etching the metal slightly with an acid.