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
Scotland in the modern era Millar and William Robertson, all of whom merged a scientific study of how humans behave in ancient and primitive cultures with a strong awareness of the determining forces of modernity. Indeed, modern sociology largely originated from this movement. Adam Smith developed and published "The Wealth of Nations," the first work on modern economics. It had an immediate impact on British economic policy and still frames 21st century discussions on globalisation and tariffs. The focus of the Scottish Enlightenment ranged from intellectual and economic matters to the specifically scientific as in the work of William Cullen, physician and chemist, James Anderson,