ICSE Class 9 Answered
Unit is the quantity of a constant magnitude which is used to measure the magnitudes of other quantities of the same nature. I can't get it
Asked by shivamkarle34.9spicertl | 13 May, 2020, 03:06: PM
Expert Answer
Unit is the quantity of a constant magnitude which is used to measure the magnitudes of other quantities of the same nature.
This sentence is elaborated in below two lines:-
The magnitude of a physical quantity is expressed as,
Physical quantity = (numerical value) × (unit)
For example, if we are going to measure mass, then the mass of the object is expressed by numerical value (which is magnitude) and unit
Mass of object, m is 50 kg
In this statement,
m - physical quantity i.e. mass
50 - numerical value (or magnitude)
kg - unit
Another example is time taken to travel from A to B is, t = 60 s
Here, t - physical quantity i.e. time
60 - numerical value (or magnitude)
s - unit
In physics units refers to the the standard by which we can measure the physical quantities.
The seven fundamental quantities and their units are as follows : -
| Fundamental quantity | Unit |
| Time | Second |
| Length | metre |
| Mass | kilogram |
| Electric current | Ampere |
| Temperature | Kelvin |
| Amount of substance | mol |
| Intensity | Candela |
Now, the line given in the question means that other quanitities other than these fundamental units are derived units.
Derived units are those which depend on the fundamental units or which can be expressed in terms of the fundamental units.
Examples of derrived units are as follows: -
Answered by Shiwani Sawant | 13 May, 2020, 06:01: PM
Concept Videos
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Measurements and Experimentation
Measurements and Experimentation, Systems of Unit and Units in SI System -
Measurements and Experimentation
Measurements and Experimentation, Systems of Unit and Units in SI System -
Measurements and Experimentation
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