Helo
Dyma'r frawddeg:
"This coalfield produced mostly high volatile, medium to strong caking coal"
Yn ôl britannica.com: "Volatile matter is material that is driven off when coal is heated to 950 °C (1,742 °F) in the absence of air under specified conditions. It is measured practically by determining the loss of weight. Consisting of a mixture of gases, low-boiling-point organic compounds that condense into oils upon cooling, and tars, volatile matter increases with decreasing rank. In general, coals with high volatile-matter content ignite easily and are highly reactive in combustion applications."
Dw i ddim yn siŵr ydi "anweddol" yn ateb y galw yma.
Ac yna "caking coal":
"When many bituminous coals are heated, they soften and form a plastic mass that swells and resolidifies into a porous solid. Coals that exhibit such behaviour are called caking coals."
Diolch am unrhyw help,
Siân
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