Energy content of biofuel (J/kg) or equivalent units. Energy density is the amount of energy stored in a fuel per unit volume, expressed in SI units as joule per litre (J/L) or equivalent units. The table below includes entries for popular substances already used for their energy, or being discussed for such use. The second column shows specific energy, the energy content in megajoules per unit of mass in kilograms, useful in understanding the energy that can be extracted from the fuel. The third column in the table lists energy density, the energy content per liter of volume, which is useful for understanding the
Department of Scientific and Industrial Research (United Kingdom) purposes. Large areas of research were the responsibility of other bodies - aviation, atomic energy, agriculture, health and medicine, meteorology - though it might undertake specific investigation on behalf of the responsible departments. The department encouraged and supported scientific research in universities and other institutions by means of grants for special research projects, research fellowships, studentships, grants to research associations and research contracts. The department absorbed or created a number of research organisations, which included large laboratories for special fields of work. Existing institutions for which it assumed responsibility were the National Physical Laboratory from the Royal Society in 1918,