# The world's smallest playable guitar is 13 micrometer long. Express the length in standard form.

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Standard form and scientific notation are the same thing. To write in standard form, we want to use SI units and convert the number to the exponential form of a x 10^b.

1 micrometer = 10^(-6) meters.

15 micrometers = 13 x 10^(-6) meters.

Though meter (m) is the basic unit of length as per SI units, use of multiples and subdivisions of meter is also permitted in the SI system. Different standard practices are used by people in different profession. For measurement of small lengths such as a guitar that is just 13 micrometers, some alternative standard representation of its length will be:

- 13 micrometers
- 13x10^-6 meters
- 13x10^-6 m
- 0.013 millimeters
- 0.013 mm

An engineer will perhaps describe this length as 13 microns.