Q:
# What Is the Base Unit of Measure for Length in the Metric System?

**The meter is the metric system's base unit of length.** Since 1983, the meter has been defined as the distance light travels in 1/299,792,458 of a second. The earliest definition of a meter had it as the one ten-millionth of the distance from the equator to the North Pole.

The meter is about 3 feet and 3 inches long. The unit was created out of a need presented by the scientific revolution going on in Western Europe in the 17th and 18th centuries: how to accurately measure quantities in a way that would be understood across international borders. At the time, systems of measurement differed from place to place.

The meter was first established in 1795 in revolutionary France. When smaller or larger units for length are needed, units that are powers of 10 greater or less than the meter are used. For example, the centimeter is 1/100 of a meter, while a kilometer is equal to 1,000 meters.

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Q:
## How Does the Metric System Differ From SI?

A: The metric system is different from SI or International System of Units in that it has only three base units, whereas the SI has seven base units. Also, th... Full Answer >Filed Under: -
Q:
## What Metric Unit Is Used to Measure Weight?

A: The unit used to measure weight in the metric system is the gram. Other metric units for weight include the kilogram, the metric ton and the milligram. Full Answer >Filed Under: -
Q:
## What Is the Purpose of Using Prefixes in the Metric System?

A: The prefixes used within the metric system serve to designate a multiple or subdivision of a unit. The most common prefixes include: mega-, kilo-, centi-, ... Full Answer >Filed Under: -
Q:
## How Many Inches Is 25mm?

A: According to the Oxford Dictionaries, one millimeter is a unit of measure for length that is equal to 0.039 inches. Therefore, 25 millimeters is equal to 2... Full Answer >Filed Under: