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Answer for the clue "Physics unit that sounds like a gem ", 5 letters:
joule

Alternative clues for the word joule

Word definitions for joule in dictionaries

Wiktionary Word definitions in Wiktionary
n. In the International System of Units, the derived unit of energy, work and heat; the work required to exert a force of one newton for a distance of one metre. Also equal to the energy of one watt of power for a duration of one second. Symbol: J

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
unit of electrical energy, 1882, coined in recognition of British physicist James P. Joule (1818-1889).

Wikipedia Word definitions in Wikipedia
The joule , symbol J , is a derived unit of energy in the International System of Units . It is equal to the energy transferred (or work done) to an object when a force of one newton acts on that object in the direction of its motion through a distance ...

Usage examples of joule.

GeV, requires an energy input of about 7,000 joules and a persistent circulating current of 250 amps, if a 20 km deployed superconducting wire coil is used.

When the discharge setting is activated, a stream of particles are released through that lens, a power of about two thousand joules to a three-second burst.

And when one collapses, all those Joules come out at once, one way or another.

They had discovered the X ray, the cathode ray, the electron, and radioactivity, invented the ohm, the watt, the Kelvin, the joule, the amp, and the little erg.