fermi
Fermi
The smallest unit for measuring distance is the attometer. The attometer is equal to one 1,000,000,000,000,000,000th of a meter. This is the only unit small enough to provide some degree of precision when measuring distances on the atomic level - like the diameter of an atom's electron cloud.
Given an atom with diameter of 100 picometers, the diameter in inches is 4 nano inches.
Cloud cover is usually given as a percentage, there is no unit of measure.
First of all it's "What unit of measurement would you use to measure the diameter of a drink can?" Secondly you would probably use either centimeters or inches, depending on where you are in the world.
milimetersMilliliter
millimetres or mm
centimetres or inches
One Okta = One eighth of the sky covered by cloud.
joules or kilo-joules
The mathematical equation which describes how to measure the distance from Earth to the moon using Earth's diameter as a unit of measure is d = Dcot(p/2)/2 Where d is the distance from Earth to the moon, D is the diameter of the Earth and p is the angle of parallax subtended at moon by the diameter of the Earth.
You should clarify what you want to measure about it: its diameter, mass, weight, color, etc. If you want to measure its diameter, that would usually be specified in microns (= micrometers).