Answer:
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Explanation:
Answer:
Mohs hardness, rough measure of the resistance of a smooth surface to scratching or abrasion, expressed in terms of a scale devised (1812) by the German mineralogist Friedrich Mohs. The Mohs hardness of a mineral is determined by observing whether its surface is scratched by a substance of known or defined hardness.
Related Topics: hardness
To give numerical values to this physical property, minerals are ranked along the Mohs scale, which is composed of 10 minerals that have been given arbitrary hardness values. The minerals contained in the scale are shown in the Table; also shown are other materials that approximate the hardness of some of the minerals. As is indicated by the ranking in the scale, if a mineral is scratched by orthoclase but not by apatite, its Mohs hardness is between 5 and 6. In the determination procedure it is necessary to be certain that a scratch is actually made and not just a “chalk” mark that will rub off. If the species being tested is fine-grained, friable, or pulverulent, the test may only loosen grains without testing individual mineral surfaces; thus, certain textures or aggregate forms may hinder or prevent a true hardness determination. For this reason the Mohs test, while greatly facilitating the identification of minerals in the field, is not suitable for accurately gauging the hardness of industrial materials such as steel or ceramics. (For these materials a more precise measure is to be found in the Vickers hardness or Knoop hardness) Another disadvantage of the Mohs scale is that it is not linear; that is, each increment of one in the scale does not indicate a proportional increase in hardness. For instance, the progression from calcite to fluorite (from 3 to 4 on the Mohs scale) reflects an increase in hardness of approximately 25 percent; the progression from corundum to diamond, on the other hand (9 to 10 on the Mohs scale), reflects a hardness increase of more than 300 percent.
The correct answer for the question that is being presented above is this one: "For the first time, blue-collar workers were guaranteed an eight-hour day and a decent wage." The workforce change in the United States during the 1950s is that <span>For the first time, blue-collar workers were guaranteed an eight-hour day and a decent wage.</span>
A, C, and D. The only country that didn’t fight with the allies was Sweden :)
In the Renaissance, humanism was reborn, following the classic teachings of ancient Greece, where the point is on human nature, naturism. Perspective and light are used to show human nature in realistic proportions. This creates a Renaissance art, which is completely different from the medieval church art. In addition, the teaching of the Church is neglected, emphasizing the medieval church view of the world as dark. The Theory of Geocentricity, represented by the Church, is rejected, and within the science there are new theories about the movement in the cosmos, advocating the Heliocentric system. Science is developing at all, and emphasizes the secularist approach to life, enlightenment, education, and democracy, whose roots are drawn from ancient Greece, and ideas about democratic governance, derived from the Enlightenment movement, are set.
