Physical Quantities

Physical quantities

Physical quantities are well defined measurable properties.

Examples

Length

 Mass

Speed

Temperature

 

Good, bad or happiness are things in our life , they’re not measurable, therefore not Physical quantities

 

Units

Unit is a standard amount ( part) of a given Physical quantity , which use to measure that specific  physical quantity as how many standard such parts are included for a given quantity.

 

Examples

For length –  meter, feet, mile ect……….

For time – seconds, minutes, days ect…………

 

 Basic quantities and Derived quantities 

Physical quantities are divided in to two groups by considering their nature and applications

1)      Basic (fundamental) quantities

2)      Derived (secondary) quantities

Base quantities

Base quantity	Name	Symbols
Length Mass Time Electric current The modynamic temperature Amount of substance Luminous intensity	Metre Kilogram Seconds Ampere Kelvin Viole candela	m kg s A K mol cd

 

Ø  Physical quantities have a numerical value and a unit.

Eg :- 10kg, 10s, the value, kg is the unit

Ø  These are physical quantities

Eg :- Mass, length, Time

Ø  The fundamental (base unit) of physical quantities.

Ø  The sI base quantities there units.