In engineering and science, a system of units called SI is used. The same units are used worldwide in most countries outside of the United States, except that in practice, some non-SI units are used as well (for example, hours and days instead seconds, and the degree Celsius instead of Kelvin).
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Standard units are used for measurmen as there is a system called the SI units and that is considered as the international system of units that is why we use standard units for measurment .
One million meters is called a "megameter." The prefix "mega-" denotes one million in the International System of Units (SI). This unit is commonly used in scientific and engineering contexts to represent large distances.
the si system of measurement is the standard set of units accepted throughout the world.
SI means "International System [of Units]" (from the French abbreviation).
There are two standard measurement units that are used across the world. Most countries either implore that metric system or what is called the US System.