This document compares three systems of measurement units: the SI (International System of Units), CGS (centimeter-gram-second) system, and AE (American Engineering) system. It lists the base units for common physical quantities like length, mass, time, and temperature in each system. For example, the SI and CGS systems use meters and centimeters respectively for length, while the AE system uses feet. Kilograms and grams are used for mass in the SI and CGS systems, and pounds for mass in the AE system.

1. SI Unitsvs. CGS Units vs AE
(Note:SI – Le Systeme Internationaled'Unites,CGS–centimeter-gramsystem, AE- American
Engineeringsystem)
Base Units
Quantity Unit Symbol System
Length Meter m SI
centimeter cm CGS
Foot ft AE
Mass Kilogram Kg SI
Gram G CGS
Pound-mass lbm
Moles Gram-mole mol or g – mole SI,CGS
Time second s all
Temperature Kelvin K both
Rankine ◦R AE
Electriccurrent Ampere A Both
Lightintensity Candela Cd both