Material or Substance:
Volume:
Unit of Weight (Mass):

Mass of Substance = Volume of Substance x Density of Substance

Density of naphtha, wood = 959.51 kg/m3

Density of naphtha, wood in kilogram/gallon(UK) = 0.027262648373179856

Mass of a Substance = 0.027262648373179856 x 15

15 gallon(UK) of naphtha, wood weighs 0.4089397255976978 kilogram