Wikipedia "These are the densest woods, which produce the most heat at equal weight".
this sentence is wrong! for equal weight it is the mass PCI which counts, and the dense woods are not better: it is the light and resinous woods which have the largest mass PCI
this sentence would be true at equal volume
this sentence could be more or less true for equal weight and usual humidity, taking into account that light woods are often more absorbent and often contain more water