Last Updated
：2025/12/05
coal rank
Noun
countable
uncountable
Japanese Meaning
（地質学）石炭の成熟度、すなわち有機変成作用による炭化の進行度を示す尺度。特に、ビトリナイト反射率によって表される数値的指標。
（ plural ）
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(geology) The measure or degree of the progressive coalification (organic metamorphism) of a coal, often expressed in terms of vitrinite reflectance.
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coal rank
The geologist measured the coal rank using vitrinite reflectance to assess the basin's thermal history.
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The geologist measured the coal rank using vitrinite reflectance to assess the basin's thermal history.
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