The word meter derives from the Greek "μέτρον" or "metron", plural "metra", which means measure. Hence comes the word decimeter "deci" = "ten", centimeter "centi" = "hundred", kilometer "kilo" = "thousand". The word meter is identified as a measuring instrument that has the length of this unit and its dividers marked, in addition this instrument is known as a tape measure that is used when they need to measure the distance, this tape measure is formed by a thin sheet of aluminum steelor of the most modern that are made of carbon fibers joined through a Teflon polymer.
The meters that people use the most are those of 5, 10, 15, 20, 25, 30, 50 and 100 meters, but those of 50 and 100 meters are known as meters and they are made only of steel, because the force they use To stretch them is a lot, but otherwise if they were made with a material less resistant to steel, in which the identical elongation could be elaborated, but its effect is of course bad or harmful when it comes to achieving the objective that is precision in measurement. The parts of the measurements are marked with rivets that are pieces of metal similar to a guy that are made of copper or bronze.that are fixed on the tape every 2 decimeters and the smallest, are centimeter and millimeter with the marks and numbers painted or engraved on the area of the tape.
On the other hand, the etymology of "metro" as a subway train, comes from "metropolitan train" this metro does not speak about measurements but refers to the term railway and underground, which means that it is deep and that it is totally used to refer to these means that are very popular in the big cities of the world.
Por eso se le llama metro a los sistemas ferroviarios, en donde trabajan personas en estaciones de ferrocarril o que conducen un tren donde trasladan diariamente pasajeros que se desplazan en las grandes ciudades para unir diferentes zonas de su territorio municipal y también en sitios más cercanos.
