Measurement involves associating numbers with physical quantities and phenomena. It is affected by internal factors like precision and external factors like noise. There are four common scales of measurement - nominal, ordinal, interval, and ratio - which determine how data can be analyzed. Seven basic SI units are used to measure physical quantities like length, time, temperature, and current. Measurement is used for various purposes like medical check-ups, sports, construction, and cooking to name a few.

1. MEASUREMENT
• It is the action of measuring something –size, length or
amount of something or an amount of stuff.
• It is the process of associating numbers with physical
quantities and phenomena.
• It is the act of measuring

2. Meaning
•Measurement means
fixing a standard value
•For eg. Using a ruler to
determine the length of
piece of paper

3. Internal & External
factors
•The actual performance of
measuring instruments is
affected by numerous internal
and external factors.
•The external factors are noise
and interference
•The internal factors are linearity,
resolution, precision and

4. Scales of measurement
•Four common scales of
measurement
•Nominal, ordinal, interval
and ratio
Each scale of
measurement has properties
that determine how to

5. Seven basic SI Units
•length(metre,
m),time(second,
S),amount(mole),current(
ampere,
A),temperature(kelvin,

6. Characteristics
•Validity
•Reliability
•Accuracy
Validity ensures the ability of the
instrument to measure the intended
concept.
A measure could be highly stable and
consistent,but may not be valid.

7. Uses of measurement
•Medical check- up
•Sports competition
•House/building
construction
•Controlling temperature in
appliances while cooking

8. Need for measurement
•It plays an important role in our
lives, as we need to measure
many things from time to time.
For eg, if we have to travel to
some place, we need to know
exactly how far it is, so that we
can decide the mode of transport
to be used.