Discuss about the classification of quantities.
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classification of physical quantities are :----
- dimensionless or non dimensional variable
- all the quantities which are variable but have no dimension Aqua dimensionless variables .
example specific gravity ,strain and efficiency of machine etc
because they are in ratio of two identical unit.
2. diamensional variable
- all the valuable quantities which have got some dimensions are called as dimensional variable for example for momentum velocity power force etc .
3. dimensionless or non dimensional constant
- the constant quantities which have no dimension such as your number 1,2,3 etc are called dimensionless constant .
4. dimensional constant
- certain quantity is like velocity of light in vacuum and gravitational constant have got a fixed value and also have what certain dimensions are called dimensional constant.
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CLASSIFICATION
- Scalar quantity: The physical quantities which have only magnitude but no direction are called scalar quantity.
- vector quantity:-It is a physical quantity which have both magnitude and direction,and follow the law of vector addition
- Fundamental quantity:- Fundamental quantity is a quantity which don't depend on other quantityfir it's measurements
- derived quantity:- derived quantity is a quantity which depend on other quantity for their measurements
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