The issue of naming coal with different particle sizes
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How can coal of different particle sizes be named more scientifically? For example, how can reasonable definitions be established for lump coal, crushed coal, briquette coal, pulverized coal, etc.?
They are generally named according to their size!
This standard could not be found; it should be determined based on the particle size – for example, what we commonly refer to as 3-8 pieces means 3-8 cm