The base unit of length in the SI (metric) system is the metre.
In 1960, the metre was defined as equal to 1,650,763.73 wavelengths of the
orange-red emission line in the electromagnetic spectrum of the krypton-86 atom
in a vacuum.
In 1983, the definition of the metre was changed to be the path travelled by light
in vacuum during a time interval of 1/299,792,458 of a second.
I was taught that radon gas or the wavelength of radon was considered to be one meter one cycle only equals one meter they chose radon because the wavelength does not change with temperature and pressure fluctuations
The basic unit in the metric system for length is the meter.
Metre is the SI, or metric, base unit of length.
The base unit of length in the International System of Units (SI) is the meter (m).
The metric unit for length is the meter (m). It is the base unit for length in the International System of Units (SI).
The official system of measurements is the SI; it has SEVEN base units.
The basic unit in the metric system for length is the meter.
The base unit for length is the metre.
Metre is the SI, or metric, base unit of length.
The base unit of length is the metre.
The base unit of length in the International System of Units (SI) is the meter (m).
The metric unit for length is the meter (m). It is the base unit for length in the International System of Units (SI).
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meters
The official system of measurements is the SI; it has SEVEN base units.
By unit of length and distance and conversion ,we can say that the basic unit of length in the metric system the meter.
The base unit for length is the metre.
the base unit of length is the metre.