NCERT Based Notes by an NITian

2. UNITS AND MEASUREMENTS 2.1 INTRODUCTION Units: The certain basic, arbitrarily chosen, internationally accepted reference standards are called units. Example : kilogram, metre, metre per second, etc. Measurement: The comparision of a physical quantity with a certain basic, arbitrarily chosen, internationally accepted reference standard is called its measurement. Classification of units: (i) Fundamental or base units: The units for the fundamental or base quantities are called Fundamental or base units. They are not derived from/independent on other units. Example : metre, kilogram, second, etc. (ii) Derived units: The units which can be expressed as the combination of the base units are called derived units. Example : metre per second, kilogram metre per square of second, etc. NOTE : The complete set of these units, both the base units and derived units, is known as the system of units . 2.2 THE INTERNATI...

2. UNITS AND MEASUREMENTS 2.1 INTRODUCTION Units: The certain basic, arbitrarily chosen, internationally accepted reference standards are called units. Example : kilogram, metre, metre per second, etc. Measurement: The comparision of a physical quantity with a certain basic, arbitrarily chosen, internationally accepted reference standard is called its measurement. Classification of units: (i) Fundamental or base units: The units for the fundamental or base quantities are called Fundamental or base units. They are not derived from/independent on other units. Example : metre, kilogram, second, etc. (ii) Derived units: The units which can be expressed as the combination of the base units are called derived units. Example : metre per second, kilogram metre per square of second, etc. NOTE : The complete set of these units, both the base units and derived units, is known as the system of units . 2.2 TH...