NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics Physics and Measurement-SI Units Revision (Page 1 of 3)

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# Units of Physical Quantities

• The chosen reference standard of measurement in multiples of which, a physical quantity is expressed is called the unit of that quantity. There are two types of physical quantities based on direction.

• Scalars Quantities: The physical quantities which can represent by only magnitude but no direction are called scalar quantities. i. e. , mass, density, volume, time, etc.

• Vectors Quantities: The physical quantities required both magnitude and direction to represent it and obey la

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# Table of SI Prefixes

 Power of 10 Prefix Symbol 18 Exa E 15 Peta P 12 Tera T 9 Giga G 6 Mega M 3 Kilo K 2 Hecto H 1 Deka Da -1 Deci D -2 Centi C -3 Milli M -6 Micro Μ -9 Nano N -12 Pico P -15 Femto F -18 Atto A

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# Conversion of units of Base Quantities

Conversion Tables: When we convert a physical quantity from one set of units to the other, the multiplication factor is required, it is called conversion factor.

Hence, Magnitude of a physical

While conversion from one set of units to the other the magnitude of the quantity must remain same.

Mass:

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