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Table of Contents
Introduction References & Edit History Related Topics
Quizzes
Electric power lines against sunset (grid, power, wires, electrical, electricity)
Energy & Fossil Fuels
barometer. Antique Barometer with readout. Technology measurement, mathematics, measure atmospheric pressure
Fun Facts of Measurement & Math
Related Questions
Read Next
Blackboard inscribed with scientific formulas and calculations in physics and mathematics
The World Science Festival’s Pioneers in Science
Laboratory glassware (beakers)
5 Quizzes That Will Tell You Whether You Should Have Been a Scientist
Abstract vector hi speed internet technology background
History of Technology Timeline
Binary Computer Code, Binary Code, Internet, Technology, Password, Data
How Does Wi-Fi Work?
Centimetres vs inches, metal rulers on a white background with clipping path.
15 Questions About Units of Measurement Answered
Discover
Ahura Mazda - relief of the Zoroastrian god Ahura Mazda at the ancient ruins of Persepolis in Iran. Also known as Ormazd Zoroastrianism,
Which Religion Is the Oldest?
Entrants falling and tumbling over while chasing the cheese at the 2016 'Cheese Rolling' held at Cooper's Hill, in the Cotswolds, Brockworth England
7 of the World’s Most Dangerous Festivals
Stylish light blue jeans on wooden background, closeup of inset pocket
Why Do Jeans Have That Tiny Pocket?
A mug shot taken by the regional Colombia control agency in Medellin
Pablo Escobar: 8 Interesting Facts About the King of Cocaine
Christmas tree, holiday, pine
How Did the Tradition of Christmas Trees Start?
Ruminant. Deer. Red deer. Cervus elaphus. Buck. Stag. Antlers.
9 of the World’s Deadliest Mammals
The Jeff Koons tulips sculputure outside the Guggenheim Museums in Bilbao, Spain, Basque Country.
What’s the Difference Between Modern and Contemporary Art?

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quad, unit of energy equal to 1 quadrillion (1015) British thermal units (BTUs). The quad is a convenient unit for describing national and world energy resources. One quad is also equal to 293 billion kilowatt-hours or, for fuels of average heating values, the energy of 183 million barrels of petroleum, 38.5 million tons of coal, or 980 billion cubic feet of natural gas. World energy consumption in 2010 was estimated at 524 quads.

This article was most recently revised and updated by Richard Pallardy.