POWERS OF TEN. “ power of 10 ” means 10 raised to some number; e.g.: 10 2 = 10 10 10 5 = 10 10 10 10 10 10 n = n factors of 10; n = “exponent” scientific notation:
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apart from few exceptions, “metric units”, or rather “SI units” are used throughout the world; (“SI” stands for “Système International”, maintained by the “Societé Internationale des Poids et Mesures”, = international society of weights and measures, with seat in Sèvres near Paris)
basic units are, e.g.: meter for distance, kilogram for mass, second for time;
meter originally defined as 1/(4 107) length of Earth's meridian; now defined in terms of speed of light;