Video Description
Measurement - CBSE NCERT Science
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About this Video:
Measurement
It is the comparison of an unknown quantity with a known fixed quantity called "UNIT".
Things one should know in order to measure any particular quantity.
The unit of measurement
The number of units that particular quantity measures
Measurements in Ancient Times
HANDSPAN
CUBIT
FOOTSTEP
A YARD
ARM LENGTH
INTERNATIONAL SYSTEM OF UNITS
Different standard units of measurement were created at different places. For the sake of uniformity, scientists all over the world have accepted a set of standard units of measurement......
This standard system of unit is known as the INTERNATIONAL SYSTEM Of UNITS..i.e., SI units
FUNDAMENTAL UNITS
DERIVED UNITS
MEASUREMENT OF LENGTH
LENGTH IS MEASURED AS A DISTANCE BETWEEN TWO POINTS OR OBJECTS.
THE STANDARD UNIT OF MEASUREMENT OF LENGTH IS A 'METRE' WHICH IS WRITTEN AS 'm'.
THE MEASURED VALUE CONSISTS OF TWO PARTS.
E.g: If the length of a desk is 2m, it means that a meter length is repeated 3 times.
INSTRUMENTS USED FOR MEASURING LENGTH
MEASURING TAPE
METER RULER
METER ROD
METER SCALE
The type of instrument depends on the type of work and the accuracy that is needed
PARALLEX ERROR
An error caused due to the wrong position of eye while taking the readings.
Measuring the length of a curved line
Put a knot near one end of a thread.
Place the knot at the beginning of the line at A and press it with your thumb.
Place a portion of the thread along the curved line and press it with your forefinger.
Keeping your finger pressed move the thread along some portion of the line.
Repeat the steps 3 and 4 to trace the entire length of the curved line using the thread.
When the thread reaches the end, put a mark on it.
Stretch out the thread on a scale and measure its length with the help of a measuring scale.
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