physical quantity:A quantity that can be measured by instrument, clearly described and has proper units is called physical value. Physical quantities are defined as基本的and衍生的quantities.
基本单位：不取决于任何其他物理数量的物理价值称为基本物理量，例如长度；质量和时间称为基本单位。
Derived units:The units that may be derived from fundamental units are called derived units.
Example: Find the acceleration unit?
solution:加速度=速度/时间= v/s = m/s2
单位系统：有三个单元系统。
Name of system |
Fundamental unit of |
长度 |
mass |
时间 |
F.P.S. |
F哦 |
pound |
sEcond |
C.G.S. |
Centimetre |
G内存 |
sEcond |
m.K.S. (S.I.) |
meter |
kiLogram |
sEcond |
In physics SI system is based on seven fundamental and two supplementary units.
（i）基本单位：
s.no. |
Basic Physics |
基本单位 |
symbol |
1。 |
mass |
kilogram |
kg |
2。 |
长度 |
meter |
m |
3。 |
时间 |
sEcond |
s |
4。 |
Electric current or Charge |
ampere or coulomb |
A or Q |
5。 |
Temperature |
kelvin or Celsius |
K或°C |
6。 |
发光强度 |
candela |
光盘 |
7。 |
Quantity of matter |
痣 |
摩尔 |
(ii) Supplementary units:
s.no. |
supplementary Physical Quantities |
补充单位 |
symbol |
1。 |
plane angle |
Radian |
rad |
2。 |
结合角 |
斯特拉德 |
Sr |
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