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
Scientific method and religion Scientific method and religion Some controversies exist over the relationship of scientific method to religion. For example, some dispute to what degree scientific method had its origins in Christian theism, or to what degree the scientific method as understood in the 21st century is compatible with religion. In the 18th century, the birth of the scientific method was largely credited to the work of Francis Bacon, Isaac Newton, and John Locke. Modern history suggests that much earlier figures such as Roger Bacon and Islamic scientists also played an important role in shaping the experimental method. Thomas Jefferson wrote "Bacon, Locke