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The kelvin is defined by setting the fixed numerical value of the Boltzmann constant k to 1.380 649 × 10 −23 J⋅K −1, (J = kg⋅m 2 ⋅s −2), given the definition of the kilogram, the metre, and the second. mole: mol amount of substance: The amount of substance of 6.022 140 76 × 10 23 elementary entities.
The IS-7 heavy tank design began in Leningrad in 1945 by Nikolai Fedorovich Shashmurin [1] [2] [5] Weighing 68 tonnes, thickly armoured and armed with a 130mm S-70 long-barrelled gun, it was the largest and heaviest member of the IS family [4] and one of the most advanced heavy tank designs. [1] An IS-7 during trials, 1948