Everything measureable has a unit it is measured in.
Angular Measure
Mass is expressed in grams in the SI system and slugs in the English system. (these are the base units obviously multiples of these units exist. ex: kg). Volume is expressed as a cubic of any unit of length ex: M^3.
slug-feet/second
Area is always expressed in some unit of area. This is often some unit of length, squared - for example square meters, or square millimeters. However, there are units (such as the acre) which are not the square of a unit of length.
Velocity may be expressed as cm/second in CGS units and as m/sec in SI units. Other units include kilometers/hour (kph), miles per hour (mph), and feet/sec (fps)
Directions are expressed as units of
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.
The units of probability density are typically expressed as the reciprocal of the units of the variable being measured. For example, if the variable is measured in meters, the units of probability density would be expressed as 1/meters.
The concentration of the solution is expressed in micromolar 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
Assuming you mean "phase", it is usually expressed in angular units - degrees, or radians.
Wavelength (Apex)
Angular Measure
grammes and kilogrammes
Kinetic energy is typically expressed in units of joules (J) in the International System of Units (SI). However, it can also be expressed in electronvolts (eV) in the field of particle physics.