Question

Everybody knows e=mc2 But what are the units? Is e in ergs, btu, horsepower, etc. Is m in gms, tons, lbs, etc? Is c in km/sec, mph, inches/day, etc?

Asked by: Donald Hobbs

Answer

All the parameters are in SI units. e.g: e (in Joules), m (Kilograms) and c (meters/second). However you can convert into your favourite units, taking into account the proper relations in between.

Answered by: Buddhadev Mukherjee, Research Scholar,Nuclear Science Center, India

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'The strength and weakness of physicists is that we believe in what we can measure. And if we can't measure it, then we say it probably doesn't exist. And that closes us off to an enormous amount of phenomena that we may not be able to measure because they only happened once. For example, the Big Bang. ... That's one reason why they scoffed at higher dimensions for so many years. Now we realize that there's no alternative... '

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