dB per kilometer
Note: Depends on frequency of the radio signal, and on the rate at which rain is falling.
Attenuation is a measure of how much loss a signal experiences when it travels down a communication medium( loss as heat, absorbed by communication medium).It is mesured in decibels Attenuation is a term that refers to any reduction in the strength of a signal, when transmitting over a long dinstance. Attenuation occurs with any type of signal, whether digital or analog. It is also called loss of signals, The extent of attenuation is usually expressed in units called decibels (dBs).
Directions are expressed as units of
NTU : Nephelometric Turbidity Units FAU : Formazin Attenuation Units
The surface area of a shape is expressed in square units.
Here are some international units of measurement:Mass is expressed in kilograms.Length and distance is expressed in meters.Time is expressed in seconds.Electrical current is expressed in amperes.Speed is expressed in meters/second.
Average weight of an element expressed in Atomic Mass units.
It is expressed in cubic units.
Mass is not expressed in kilometers (km). That is a measure of distance. Mass is expressed in units of kilograms (kg)
-- The distance that light travels in some amount of time is expressed in units of distance. -- The time that it takes light to cover some amount of distance is expressed in units of time. -- The speed of light is expressed in units of speed . . . distance/time
The concentration can be expressed in mole/litre.
Assuming you mean "phase", it is usually expressed in angular units - degrees, or radians.
Angular Measure