Question

What is SI system? Why the unit of density is known as derived unit? Give any two differences between fundamental and derived unit? Give the SI unit of luminous intensity and electric charge?If you answer correct I mark you as brainlisted​

Answer 1

Answer:

The answer to what is SI unit is that it is an abbreviation of the French word Système International. The International System Of Units (SI) is the metric system that is used universally as a standard for measurements. ... It is made up of 7 base units which are used for defining 22 derived units.

Explanation:

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Answer 2

Answer:

SI unit is an international system of measurements that are used universally in technical and scientific research to avoid the confusion with the units. Having a standard unit system is important because it helps the entire world to understand the measurements in one set of unit system.

Density is a derived unit because it's not reported as a pure unit. (A pure unit would be something like kilograms or meters.)

Difference between fundamental and derived unit are:

Fundamental Unit :

• Fundamental units are all those units which are independent of any other unit (including themselves).

• Fundamental units cannot be further reduced to elementary level; in fact, these are elementary units.

• Fundamental units cannot be expressed in terms of derived units.

• Only seven fundamental units exist in Metric System or SI system.

Derived Unit:

• Derived units are all those units which are obtained by multiplying and/or dividing one or more fundamental units with or without introducing any other numerical factor.

• Derived units can be reduced to its elementary level, which are composed of fundamental units.

• Derived units can be expressed in terms of fundamental units.

• There exist a large number of derived units in Metric System.

The basic SI unit of luminous intensity is candela. The brightness of an illuminated surface is measured in candela per square meter.

The SI unit of electric charge is the coulomb which is a derived SI unit and is represented by the symbol C. A coulomb is defined as the amount of charge that passes via electrical conductor carrying one ampere per second.

Additionally, the cgs unit of electric charge is expressed as a combination of three fundamental quantities like mass, length, and time.

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