Imperial & S.I. units for chemical & physical parameters

a) Basic Physical quantity

	Unit
Quantity	Name	Symbol
Length	metre	m
Mass	kilogram	kg
Time	second	s
Electrical current	ampère	A
Thermodynamic temperature	Kelvin	K
Amount of substance	mole	mol
Luminous intensity	candela	cd

b) Derived Physical quantity eg:

	Unit		Expression
Quantity	Name	Symbol	in other SI units	in terms of base SI units
Frequency	hertz	Hz		s^-1
Force	newton	N		m·kg·s^-2
Pressure	pascal	Pa	N·m^-2	m^-1·kg·s^-2
Energy, work, quantity of heat	joule	J	N·m	m^2·kg·s^-2
Power	watt	W	J·s^-1	m^2·kg·s^-3
Quantity of electricity	coulomb	C		s·A
Electrical potential	volt	V	W·A^-1	m^2·kg·s^-3·A^-1
Electrical resistance	ohm	W	V·A^-1	m^2·kg·s^-3·A^-2