Menene Girman Tarin Coal

An rarraba kwalta kwal zuwa nau'i uku: Kwal mai ƙarancin zafin jiki, kwalta mai matsakaicin zafin jiki, da kwal mai zafi mai zafi.

Kwalta kwal tana da yawan jujjuyawa tsakanin 1.17 kuma 1.19 grams da cubic santimita, fassara zuwa game da 1.17 ku 1.19 ton a kowace murabba'in mita.

A kwatanta, yawa na biotar yawanci yana zaune a kusa 1.2 grams da cubic santimita, daidai da 1.2 ton a kowace murabba'in mita.