Unit of Length
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The meter and the kilogram had their origin in the metric system. Meter was originally defined as one 10 millionth of the distance from the North Pole to the equator of the Earth. By international agreement, the standard meter had been defined as the distance between two fine lines on a bar of platinum-iridium alloy preserved at constant temperature of 273.16 K at one bar pressure.
The 1960s conference, defined the meter as 1,650,763.73 wavelengths of the reddish orange light emitted by the isotope krypton-86. The meter was again redefined in 1983 as the length of the path travelled by light, in vacuum, during a time interval of 1/299,792,458 of a second. Accuracy can be measured to 1 part in 10 13 .
Units based on meter are:
1 km = 1000 m = 103m
1 cm = 1/100 m = 10-2m
1 mm = 1/1000 m = 10-3m
1 um = 1/1000000 m = 10-6m
1 nm = 1/1000000000 = 10-9m
Very small distances are measured in micrometres or microns, angstroms, nanometers(nm) and femtometers(fm)
1m = 103mm = 109 nm
Large distances such as distances of star from the earth are expressed in Light year. Light year is a unit of length equal to the distance travelled by light in one year.
1 light year = 9.46 x 1015m
Range of lengths
| Size of objects for distances
|| Length (m)
| Radius of a proton ||10-15 |
| Size of atomic nucleus || 10-14|
| Size of hydrogen atom || 10-10|
| Length of typical virus || 10-8|
| Wavelength of light || 10-7|
| Size of red blood Corpuscle||10-5 |
| Thickness of the paper || 10-4|
| Height of the Mount Everest above sea level || 104|
| Radius of the Earth ||107 |
| Distance of bone from the Earth ||108 |
| Distance of the sun from the || 1011|
| Distance of Pluto from Sun || 1013|
| Size of our Glaxay ||1021 |
| Distance of Andromeda galaxy||1022 |
| Distance to the boundary of observable universe ||1026 |
| || |
| To measure the large distances, such as star or a planet, an important method is Parallex Method. In this method and object is observed from two different points. |