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.
Protect the rights of individuals from the federal government
The passage supports the claim of the passage by indicating that the addition of sugar was a significant change to Europeans' diets. Thus the last option is correct.
<h3>Who were Europeans?</h3>
Europeans were the the people who live in the continent of Europe.The Europe comprises of the countries like Russia, Germany, England, France, Italy, Poland, Spain,Ukraine, Romania etc.
The complete question is attached below.
The above passage indicates that sugar played important role in the diet of the Europeans as it says that Sugar was given its on place as in the dessert. It became the food of necessity.
Sugar didn't only had the impact on the wealthy Europeans diet but also on the England's poorest workers also included it in their diet. Thus the last option is correct.
Learn more about Europeans here:
brainly.com/question/3387326
#SPJ1
Explanation:
jdjejsdjsjejjxhdjajdjjsjfjjsjxo
61 since he was born in 1908 was took office in 1969
