world energy = 5.81 × 1017 kJ
1 Btu = 1054J
1 quad = 1012 Btu
World energy supplies are often measured in the unit of quadrillion British thermal units (1012 Btu), generally called a "quad." In 2015, world energy consumption is projected to be 5.81 × 1017 kJ.
The use of the British thermal unit (Btu) is common in much engineering work. (1 Btu = 1054J) A Btu is the amount of heat required to raise the temperature of 1 lb of water by 1 °F. How many quads of energy does world energy consumption quantity represent?
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