Q:

What is the hardness of coal?

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Quick Answer

The most common type of coal is anthracite, which has a hardness of 2.2 when compared to the Moh's scale of mineral hardness, according to the Ted Pella website. However, since coal is not a mineral, it is not officially measured in this way.

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What is the hardness of coal?
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Full Answer

Generally, the higher the value on the Moh's scale, the harder the material. The Moh's hardness is generally too subjective for anthracite since it does not have a completely uniform internal structure and might be harder or softer in different spots. For example, when a piece of coal fractures, it appears to be softer. The hardest mineral on the scale is the diamond, while the softest is talc.

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Related Questions

  • Q:

    Where is coal found?

    A:

    Coal reserves exist in every country in the world and on every continent except Antarctica. According to the World Coal Association, there are enough coal reserves to meet current demand for 112 years, but only enough oil and gas reserves to meet current demand for the next 46 and 54 years, respectively.

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  • Q:

    What are the uses of coal?

    A:

    According to the World Coal Association, the primary uses of coal are in electricity generation, the creation of liquid fuel, the production of steel and cement manufacturing. There are two primary types of coal, thermal coal and metallurgical coal. Thermal coal goes into fuel and electricity applications, while metallurgical coal is better suited to manufacturing and chemical applications.

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  • Q:

    When was coal discovered?

    A:

    The first recorded discovery of coal in the United States is believed to be on the Illinois River in 1679 by French explorers. Historians, though, believe that the Chinese discovered coal more than 3,000 years ago.

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  • Q:

    What are the disadvantages of coal?

    A:

    The primary disadvantages of coal stem from its adverse health and environmental effects. Burning coal produces harmful waste, including carbon dioxide, nitrogen oxides, sulphuric acids and arsenic. Coal-fired power plants are responsible for roughly 24,000 premature deaths each year in the United States, with 2,800 deaths from lung cancer alone.

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