Length is a physical measurement of distance that is fundamentally measured in the SI unit of a meter

LEARNING OBJECTIVE

·
Distinguish SI and customary units of
length

KEY POINTS

·
The SI unit for length is the
meter.

·
One meter is defined as the distance
that light travels in a vacuum in 1299,792,458 of a second.

·
Derivatives of measurement units
related to the meter are devised around the convenience of the number 10.

TERM

How far apart objects are physically.

FULL TEXT

Length
can be defined as a measurement of the physical quantity of distance. Many
qualitative observations fundamental to physics are commonly described using
the measurement of length. The distance between objects, the rate at which
objects are traveling, and how much force an object
exerts are all dependent on length as a variable. In order to describe length
in a standardized and quantitative manner, an accepted unit of measurement must
be utilized.

Many different units of length are
used around the world. In the United States, the U.S. customary units
operationally describe length in terms of the basic unit of an inch. Varying
lengths are thus described in relation to the inch, such as a foot equaling 12
inches, a yard equaling three feet, and a mile equaling 1,760 yards.

Though
regional use of different measurement units is not generally problematic, it
can raise issues of compatibility and understanding when working abroad or
collaboratively with international partners. As such, a standard unit of
measurement that is internationally accepted is needed. The basic unit of
length as identified by the International System of Units (SI) is the meter.
The meter is expressed more specifically in terms of speed of light.

One
meter is defined as the distance that light travels in a vacuum in 1299,792,458 of a second. All lengths are
measured in terms related to the meter, where its multiples are devised around
the convenience of the number 10. For example, a centimeter is equal to 1100 of
a meter (or 10−2 meters), and a kilometer is
equal to 1,000 meters (or 103 meters).

*Source,credits and courtesy: boundless.com*

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