Reisigs

Example:Many homes switched to coal instead of wood chips when reisigs became too expensive.

Definition:A combustible black or brownish-black sedimentary rock composed mainly of carbonized plant matter.

Example:The family opted to use gas for their heating needs rather than relying on wood chips.

Definition:A state of matter which expands to fill a volume, is colorless and usually consists of molecules of one or more elements or compounds.