Mole Fraction of CH4 (ch4)
https://w3id.org/hacid/data/cs/variables/mip/ch4 <https://w3id.org/hacid/onto/data/Variable>
Mole fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y.
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Mole Fraction of CH4 (ch4)
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ch4