scale and unit

Magnitude in physics is defined as something that can be measured,
and has a value of the (big) and the units. While the unit is
something that can be used as a comparison in measuring.
International Units (SI) is a unit of conference proceedings scientists
in Paris, to discuss about the weight and size. based on
scale units are divided into two, namely the amount of principal and
scale derivatives. In addition, based on the presence or absence of the direction, magnitude too
grouped into two scalar quantities and vector quantities (to be
specifically addressed in Section E).

1. Principal Amount
The amount of principal is the amount that is used as the basis for
determine the amount of the other. Principal amount of units called unit
principal and has been established in advance by mutual agreement of the
scientists. The amount of principal to be free, that does not rely on
principal amount of the other. In Table 1.1 below, presented the principal amount
agreed upon by scientists.
Table 1.1-Magnitude Magnitude Main and Her International Unit (SI)
No
Name Principal Amount Principal Amount Lambing
Coat Unit
unit
1 Meter Length l m
2 m Mass Kilogram kg
3 Time t Sekon s
4 Strong Electric Current I Ampere A
5 Temperature Kelvin K t
6 The intensity of light I Kandela cd
7 Number of substance n Mole Moles
8 Angular Field ᴓ Radian Flat Rad *)
9 angle φ space Steradian Sr *)

2. The amount of derivatives
Magnitude is the amount of derivatives that can be derived from the scale
principal. Scale units are called derived units and obtained derivatives
with some unit combines principal amount. following
a few examples of the amount of its derivatives unit.

Table 1.2 Examples of Some Derivatives and Its units Magnitude
No Name Symbol Amount Amount Derivatives Derivatives Derivatives Unit
1 area A m2
2 speed v ms-1
3 Acceleration of a ms-2
4 Style F kg ms-2
Pressure P 5 kg m-1s-2
6 Business W-2 kg M2S