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Which units are part of both the metric an the u.s system?
There are none. The second, although a unit in the SI system is, strictly speaking, not in the metric system since it is based on 60.
What are some reason that the si system uses metric uinits and not the English system?
Only three countries still cling to the "English" system, whereas the whole world uses metric. The SI units were established in 1960 as part of a review of the metric system used at the time; it uses metric units because it is the current version of the metric system.
What is the difference between a linear meter and a metric meter?
A linear meter is a meter, in a straight line, as opposed to cubic meter, which covers a 2-dimensional plane. They are both part of the metric system. There is no metric meter, other than just referring to a meter as being part of the metric system.
Definiton of Customary Unit?
A Customary Unit or non-SI unit is a measurement unit that is not part of the metric system. Customary units are mainly units of the Imperial system but they could be localised customary units - such as Gaj (for area) is South Asia.
Is there a unit smaller than a yoctometer?
Yes, there are units smaller than a yoctometer. The yoctometer (10^-24 meters) is part of the metric system, and smaller units can be defined using scientific notation, such as zeptometer (10^-21 meters) or even smaller hypothetical units, like the Planck length, which is approximately 1.616 x 10^-35 meters. However, these smaller units are primarily theoretical and not commonly used in practical measurements.
