Physical quantities
What is a physical quantities?
Subject of formula
Subject of formula: The basics
Vectors
What is a vector and how to add vector
How to subtract one vector from another
Units
Base Units
Derived units
Prefixes
Measurement of physical quantities
Volume and volume of irregular objects
Prefixes
why we need to use correct physical quantities and unit
ReplyDeleteFirst there are different units for the same quantity.
ReplyDeleteFor example the quantity length can have SI units such as m which is used in France and Imperial units such as the foot that is used in England and the USA.
One m is approximately 3.1 feet.
Suppose that some object must be 1 foot that is 30 cm but the person does not write the unit. someone in france who is only used to metre would wrongfully assumed that unit is m and would make the object 1 m long instead of 1 foot. This could be a problem is some case and human life can even be at risk. So to avoid this all quantities must be written in the proper unit to avoid problems.