2. The unit
of, length is called fundamen
tal unit but the unit of density is called
a denived unit, why?
->
Answers
Answer:
The complementary unit of length is called a fundamental unit. The unit of density is called the derived unit. Why?
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The complementary unit of length is called a fundamental unit. The unit of density is called the derived unit. Why?
SI has 7 “base” units, not fundamental units. I am unaware of why you use the word “complementary”.
Certainly, the unit for density is not “the” derived unit. There are as many as a mind can cook up.
Quoting the official definitions document for SI, the Brochure SI,
2.3.4 Derived units
Derived units are defined as products of powers of the base units. When the numerical factor of this product is one, the derived units are called coherent derived units. The base and coherent derived units of the SI form a coherent set, designated the set of coherent SI units. The word “coherent” here means that equations between the numerical values of quantities take exactly the same form as the equations between the quantities themselves.
Some of the coherent derived units in the SI are given special names. Table 4 lists 22 SI units with special names. Together with the seven base units (Table 2) they form the core of the set of SI units. All other SI units are combinations of some of these 29 units.
It is important to note that any of the seven base units and 22 SI units with special names can be constructed directly from the seven defining constants. In fact, the units of the seven defining constants include both base and derived units.
The CGPM has adopted a series of prefixes for use in forming the decimal multiples and sub-multiples of the coherent SI units (see chapter 3). They are convenient for expressing the values of quantities that are much larger than or much smaller than the coherent unit. However, when prefixes are used with SI units, the resulting units are no longer coherent, because the prefix introduces a numerical factor other than one. Prefixes may be used with any of the 29 SI units with special names with the exception of the base unit kilogram.
Answer:
because it is obtained from fundamental unit
Explanation:
depends on independent unit