There are lots of units that are used. Typically, nanometres are used for optical wavelengths,micrometres for precision engineering, small cells,
millimetres and centimetres in daily use for small lengths,
metres for objects that are larger - roughly bigger than the height of an adult,
kilometres for distances within town and between towns,
astronomical units, light years or parsecs for interstellar (and inter galactic) distances.
In most cases there are equivalent units in the near-obsolete Imperial system.
Examples are the 'meter' and the 'kilogram' respectively.
the Meter
The foot, yard, mile, gallon, quart, pound and fluid ounce are examples of units of measurement in the United States customary units system. Examples of metric units of measurement include the meter, kilometer and gram.
Quantities of measurement refer to the different units used to quantify physical attributes such as length, mass, time, and volume. Examples include meters for length, kilograms for mass, seconds for time, and liters for volume. These units help standardize measurements and facilitate accurate communication of quantities.
Length in metric units is usually in meters, centimeters, millimeters, and kilometers but there are other possible metric units of length. Volume in metric units is usually in liters, cubic centimeters or cubic meters but there are other possible metric units of volume. Mass in metric units is usually in kilograms, grams, or metric tons - although there are other possible metric units of mass.
By unit of length and distance and conversion ,we can say that units are used to measure length are meters ,cm,dm,dam,mm
Units of length, such as mm, are used for this.
Metre. But a centimetre is also used frequently.
m to the second
The standard unit of length is the meter. There are also bigger units of length like kilometers and smaller units of length like centimeter, millimeter, and micrometer among others. But the base unit of length is the meter.
Examples of length include the distance between two points, the size of an object from end to end, and the measurement of how long something is. It can be measured in units such as inches, feet, meters, or kilometers.
Examples of length with units include 5 meters, 10 centimeters, and 3 kilometers.