Angular Measure
Everything measureable has a unit it is measured in.
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.
The acidity or basicity are expressed by pH (the negative logarithm of the activity of hydronium ion).
The pH scale is logarithmic; the difference between two units is x10.
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.
pH is a pure number. It doesn't have units. It is the negative log of the hydrogen ion concentration.
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.
Angular Measure
Everything measureable has a unit it is measured in.
grammes and kilogrammes
Wavelength (Apex)
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.