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Wavelength of red light is about 700 nanometers. ie 700 x 10 to the minus 9 meters. You may also come across units called Angstroms for light wavelengths-these were current when I was a physics student but went out of fashion. 1 Angstrom = 1/10 nm
The SI unit is meter. But nanometer and angstrom are commonly used units to measure the wavelength of light.
We consider ultraviolet (UV) light, which has shorter wavelengths than visible light and longer wavelengths than X-rays, to fall in the range of 10 nm to 400 nm. This wavelength is given in nanometer units, which are 10-9 meters. A micrometer is 10-6 meters, so converting nanometers to micrometers involves multiplication by 103 or 1,000. This gives us a range of wavelengths of 10,000 micrometers to 400,000 micrometers for UV light., corresponding to photon energies from 3 eV to 124 eV
Several units are used, depending on what you want to measure. For example, in the case of sound, you can use units of energy, of intensity (energy/area), of wavelength, frequency, speed, and probably a few more.
one, ml is the abbreviation of millilitre.A millilitre is a thousandth of a litre
Among the units of measure, "cc" is the abbreviation for cubic centimeter.
Milliamp
An SI unit is a unit of measure from the International System of Units. SI is the abbreviation for the French Système international d'unités
They measure them in light-years.
SI (French abbreviation for "International System") is, in English, the metric system. So the standard measure in SI is the meter.
light years
UNITS
SI means "International System [of Units]" (from the French abbreviation).
Light year or astronomical units
One Light-year is 63,024 Astronomical units.
Wavelength of red light is about 700 nanometers. ie 700 x 10 to the minus 9 meters. You may also come across units called Angstroms for light wavelengths-these were current when I was a physics student but went out of fashion. 1 Angstrom = 1/10 nm
-- the Astronomical Unit -- the Light Year -- the Parsec -- the Magnitude