Physics Chapter 2

Exploring the Diversity of Matter and its Proprieties

*Important Notes Only

SI UNITS :

An SI unit is a unit of measurement in the International System Of Units .

SI unit is the short of ‘Systeme International’ in French which means ‘International System ‘ in English .

Base Quantity SI Unit SymbolLength metre mMass kilogram kgTime second sElectric Current ampere AThermodynamic Temperature

kelvin K

Luminous intensity

candela cd

Amount of substance

mole Mol

(Note : The candela is not metioned in the syllabus )

2C Measurement of Length

Instrument Suitable magnitude of measurement

Tape Measure A few metres e.g dimensions of a room

Metre Rule Several centimetres e.g width of a tabletop

Vernier Calipers

A few centimetrese.g thickness of a laptop