Abbreviation 
None 
Synonym 
Unitary ratio scale, ratio scale 
Definition 
Rational scale (property) has a magnitude and can be divided by another property 
Scope 
The value set is a set of numerical values. There is an absolute zero point. 
Description 
The numerical values of a quantity can be added, subtracted, multiplied and divided.
Note 1: Results have ISQ dimensions and measurement units.

Value set 
0–∞ 
Reference 
 Stevens SS. On the Theory of Scales of Measurement. Science. 1946;103(2684):677680. doi:10.1126/science.103.2684.677
 Ferard G, Dybkaer R, FuentesArderiu X. Compendium of Terminology and Nomenclature of Properties in Clinical Laboratory Sciences : Recommendations 2016. 1 ed: Royal Society of Chemistry; 2016. 182 p. doi:10.1039/9781782622451.


 catalyticactivity rate
 catalytic ratio
 diameter
 distribution width
 duration
 dynamic viscosity
 entitic amountofsubstance
 entitic area
 entitic catalytic activity
 entitic diameter
 entitic mass
 entitic number
 entitic volume
 entitic volume difference
 frequency
 halflife
 height
 impedance increment
 kinematic viscosity
 kindofproperty
 length
 length increment
 life span
 mass
 mass concentration
 mass coefficient
 mass fraction
 mass increment
 mass rate

 mass rate ratio
 mass ratio
 molality
 number of entities
 number concentration
 number content
 number fraction
 number of doses
 number ratio
 partial pressure
 pressure
 radioactivity
 reciprocal relative time
 relative time ratio
 relative amountofsubstance
 relative entitic number
 relative mass concentration
 relative mass ratio
 relative number concentration
 relative number ratio
 relative substance concentration
 relative substance fraction
 relative substance ratio
 relative time
 relative viscosity
 relative volumic mass
 relative distribution width
 relative distribution width
 substance concentration

 substance concentration increment
 substance content
 substance content rate
 substance fraction
 substance rate
 substance rate ratio
 substance ratio
 substance ratio increment
 susceptibility
 Celsius temperature increment
 gas tension
 threshold mass concentration
 threshold substance concentration
 time
 time interval
 velocity
 volume
 volume content
 volume fraction
 volume rate
 volume rate ratio
 volumic energy
