PRASHANT KIRAD
UNITS AND
MEASUREMENTS
Class-11th
, PRASHANT KIRAD
Physical Quantities
Physical Quantity refers to any property of a material or system that can be
measured and expressed numerically along with a unit.
For example, mass, length, time, temperature, and velocity are physical
quantities.
Components of a Physical Quantity
Numerical Value: Indicates the magnitude of the quantity.
Unit: Specifies the measurement standard (e.g., meter, kilogram).
Physical Quantity = Numerical Value + Unit
, PRASHANT KIRAD
Units
A unit is an arbitrarily chosen standard that is widely accepted and used
to measure physical quantities.
For example, the unit of length is the meter (m), and the unit of mass is the
kilogram (kg)
Why is “m” mentioned
Importance of Units everywhere in whole scale??
Units ensure consistency in measurements.
They allow scientists across the world to communicate results
in a standardized way.
They form the basis for calculations and comparisons in physics
, PRASHANT KIRAD
Fundamental Units
Fundamental units are standard units used to measure fundamental
physical quantities such as length, mass, time, temperature, electric
current, amount of substance, and luminous intensity. There are seven
fundamental units, and they are independent; they cannot be derived
from any other units.
Examples: Length (meter), Mass (kilogram), Time (second),
Temperature (kelvin), Electric current (ampere), Amount of substance
(mole), Luminous intensity (candela).
UNITS AND
MEASUREMENTS
Class-11th
, PRASHANT KIRAD
Physical Quantities
Physical Quantity refers to any property of a material or system that can be
measured and expressed numerically along with a unit.
For example, mass, length, time, temperature, and velocity are physical
quantities.
Components of a Physical Quantity
Numerical Value: Indicates the magnitude of the quantity.
Unit: Specifies the measurement standard (e.g., meter, kilogram).
Physical Quantity = Numerical Value + Unit
, PRASHANT KIRAD
Units
A unit is an arbitrarily chosen standard that is widely accepted and used
to measure physical quantities.
For example, the unit of length is the meter (m), and the unit of mass is the
kilogram (kg)
Why is “m” mentioned
Importance of Units everywhere in whole scale??
Units ensure consistency in measurements.
They allow scientists across the world to communicate results
in a standardized way.
They form the basis for calculations and comparisons in physics
, PRASHANT KIRAD
Fundamental Units
Fundamental units are standard units used to measure fundamental
physical quantities such as length, mass, time, temperature, electric
current, amount of substance, and luminous intensity. There are seven
fundamental units, and they are independent; they cannot be derived
from any other units.
Examples: Length (meter), Mass (kilogram), Time (second),
Temperature (kelvin), Electric current (ampere), Amount of substance
(mole), Luminous intensity (candela).
