What units are used to measure the length of an object?

Answer 1

Depending on the length involved, they may be physical, such as rulers, tape

measures, and micrometers, or optical, such as telescopes, microscopes, or

interferometers, or applications of timed echo-ranging techniques such as

Radar, Sonar, laser rangefinders, and time-domain reflectometry in transmission

media.

Once the length of an object has been measured, it may be described in terms

of any unit that produces a convenient number. Some of the more popular ones

include:

-- Angstrom

-- Micron

-- Nanometer

-- Furlong

-- AU

-- Inch

-- Parsec

-- League

-- Rod

-- Hectometer

-- Smoot

-- Light-year

-- millimeter

-- centimeter

-- meter

-- decimeter

-- kilometer

.

.

etc.

Answer 2

which metric units should be use to describe the mass of an object