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Coal is only as homogeneous as the original materials from which it is formed.
Many soft coals (lignites) are formed by the burial and compression etc, of forest or shrubland. Thus the coal formed from this will never be homogeneous, and you may find fossilized branches in the material.
Many 'brown coals' give off much gas (methane) and this is a hazard to mining.
Other coals are formed from mossy bogs, which were in a depression, and which continued to sink, with the moss continuing to fill the hollow.
Many of these coals, buried and subject to compression and heat, form coals that are much more homogeneous.
These coals, if buried sufficiently, give off very little gas, and are much darker in colour.
The lowest rank of coal would be peat, which is not changed much from the original plant material. Rank then passes through the lignites and other brown coals, then through the black shiny coals to Anthracite, the highest grade of coal. Graphite may be considered the highest grade of coal, but is not as useful a fuel as the others.
What else can I help you with?
Is coal heterogeneous or homogeneous?
Coal is considered heterogeneous because it is made up of a complex mixture of organic compounds such as carbon, hydrogen, sulfur, and other elements. This leads to variations in its composition, making it non-uniform in terms of its properties and characteristics.
What is bituminous coal texture and grain?
Bituminous coal has a smooth texture with a dark color. Its grain is typically fine to medium and can range from a banded appearance due to layering of different materials, to a more homogeneous structure.
Is a paper clip a heterogeneous or homogeneous mixture?
A paper clip is a homogeneous mixture because it is made of the same material throughout, usually metal such as stainless steel.
Is glucose a heterogeneous or homogeneous mixture?
It is a solution. And a solution is homogeneous.
Is green ink heterogeneous or homogeneous?
Green ink is homogeneous because it is a single phase solution where the ink molecules are evenly distributed throughout the solution.
Is coal a homogeneous or heterogeneous mixture?
heterogenous
Is coal heterogeneous or homogeneous?
Coal is considered heterogeneous because it is made up of a complex mixture of organic compounds such as carbon, hydrogen, sulfur, and other elements. This leads to variations in its composition, making it non-uniform in terms of its properties and characteristics.
What is bituminous coal texture and grain?
Bituminous coal has a smooth texture with a dark color. Its grain is typically fine to medium and can range from a banded appearance due to layering of different materials, to a more homogeneous structure.
Is salt homogeneous or homogeneous?
homogeneous
Is spaghetti sauce a homogeneous or heterogeneous?
Heterogenous
Is saliva a heterogeneous or homogeneous?
it is homogeneous
Is milkshake a homogenous or heterogenous?
homogeneous
Is yogurt Homogeneous or Heterogeneous?
It is a Homogeneous mixture
Is Gatorade a homogeneous or heterogeneous?
Gatorade is a homogeneous mixture.
Is a salt and sand mixture a homogeneous or heterogeneous mixture?
This mixture is not homogeneous.
Is rice and corn grits heterogeneous or homogeneous?
Rice grits is homogeneous, corn grits is homogeneous, rice and corn grits mixed is heterogeneous.
Is alcohol a homogeneous?
It is homogeneous
