# How do you find the specific gravity of coal?

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According to the U.S. Geological Survey (Wood and others, 1983), the average specific gravity of unbroken (solid) bituminous coal is 1.32. (1.32 × 62.6 lb × 43,560 ft2) / 2,000 lb/ton = 1,799.72 tons/acre-ft, which is rounded off to 1,800 tons/ acre-ft.

## How do you find the density of coal?

Weigh the water. Since density of water is @ 1 gm/1 cc ( 1000 litres/ m^3), you can take weight of water as equal to volume of the piece of coal. ((Specific gravity of water is 1) Divide the weight of coal by the volume of water to get the density of coal.

## How do u find specific gravity?

The density is directly related to the mass of the object (unit: usually in grams but can be measured in kilograms or pounds), so the specific gravity can also be determined by dividing the mass of the object by the mass of the water.

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## What are 4 types of coal?

Coal is classified into four main types, or ranks: anthracite, bituminous, subbituminous, and lignite. The ranking depends on the types and amounts of carbon the coal contains and on the amount of heat energy the coal can produce.

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## Does coal float or sink in water?

Because coal is less dense than most rocks and minerals (such as pyrite), it floats in liquids of equal or greater density than the coal; rock and pyrite sink. … The single float-sink test defines the relative amount of float-product and sink-reject that should result from the coal being washed in that preparation plant.

## What is a normal specific gravity?

The normal range for urine specific gravity is 1.005 to 1.030.

## What does a specific gravity of 1.020 mean?

Urine specific gravity is a measure of the ratio of the density of urine to the density of water. Urine specific-gravity measurements normally range from 1.002 to 1.030. 5. The NCAA selected a urine specific-gravity measurement of ≤1.020 to indicate euhydration. 4.

## What is specific gravity mean?

specific gravity. The mass of a substance, given as a multiple of the mass of the same volume of a standard substance (usually water).

## What is the texture of coal?

The texture of anthracite coal (black coal) is rough in that it is a rock, but it has a smooth, almost slippery quality as well. This may be due to very fine crystal formation within the coal, or it may be because of the hydrocarbon molecular formula that comprises coal.

## What are the features of coal?

Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements; chiefly hydrogen, sulfur, oxygen, and nitrogen.

## What type of rock is coal?

Coal is a combustible sedimentary rock formed from ancient vegetation which has been consolidated between other rock strata and transformed by the combined effects of microbial action, pressure and heat over a considerable time period. This process is commonly called ‘coalification’.

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## What is the difference between hard and soft coal?

Soft coal, in the United States, bituminous coal (q.v.), as opposed to hard coal, or anthracite. In Europe the designation soft coal is reserved for lignite and brown coal (qq. v.), whereas hard coal means bituminous coal.