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The SI comprises a coherent system of units of measurement starting with seven base units, which are the second (symbol s, the unit of time), metre (m, length), kilogram (kg, mass), ampere (A, electric current), kelvin (K, thermodynamic temperature), mole (mol, amount of substance), and candela (cd, luminous intensity).
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