List of dimensionless quantities


This is a list of well-known dimensionless quantities illustrating their variety of forms and applications. The tables also include pure numbers, dimensionless ratios, or dimensionless physical constants; these topics are discussed in the article.

Geography, geology and geophysics

Other fields

NameStandard symbolDefinitionField of application
Capacity factorenergy
Cohesion numberCohChemical engineering, material science, mechanics
Cost of transportCOTenergy efficiency, economics
Damping ratiomechanics, electrical engineering
DecibeldBacoustics, electronics, control theory
Elasticity
Eeconomics
Gain–electronics
Load factorenergy
Peel numberNPcoating
Pixelpxdigital imaging
Power factorpfelectrical
Prater numberβreaction engineering
Relative densityRDhydrometers, material comparisons