Lord Kelvin Lord Kelvin,

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Lord Kelvin Lord Kelvin,

• "When you can measure what you are speaking about
  and express it in numbers, you know something
  about it but when you cannot express it in
  numbers, your knowledge is of a meager and
  unsatisfactory kind. It may be the beginning of
  knowledge, but you have scarcely in your thoughts
  advanced to the stage of science."

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Lord Kelvin, ?????????????????????????19

• ???????????????? ???????????????????????????????
  ??????????????????????????????????????????????????
  ???????????????????? ?????????????????????????????
  ???????????????????????????? ?????????????????????
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  ??????????????????????????????????????????????????
  ?? ????????

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Fundamental Physical Quantities
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????? (Units )
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Physical Quantities
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Supplementary Units

• ????????????????SI ?? 2 ????? ???
• ??????? (Radian rad) ??????????????? (Plane
  Angle)
• ?????????? (Steradian str) ??????????????????
  (Solid Angle)

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Derivetive Units

• ????????????? ???????????????????????????????????
  ???? ??? ?? ??? ???? ?????? ???? ????????????????
  ??? ????/?????? (ms-1) ??????????? ??? ???????? x
  ????/(??????)2 ???? ?????? (kg ms-2 N) ???????

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????????????????? SI1.???????????????????????
???? ?????????????? ??????????????????????????????
??????????????? ?????? ???????????????????????????
?????????????????????????????????????????2.??????
????????????????????????????????
?????????????????? (Litre) ???????????? L
???????????????????????????????????????? ????
??????? (Ampere) ???????????? A
???????3.????????????????????????????????????
?????????????????????????????????????????? Exa(E)
, Peta(P) , Tera(T) , Giga(G) ??? Meag(M)
???????????????????????? ?????????????????????????
?????????????????????? ?????? ????????????????????
??????????????????????????????
?????????????????????????????????4.??????????????
??????????? ??????????????????????????????????????
??????????????????? ???? 5 kg ?????? 5 kgs.
?????? ??????????????????????????????????????????
????????5.????????????????????????????????????
????????????????????6. ??????????????????????????
????????????????????????????????? ???? 0.52
?????? .527. ????????????????? ??????????????
???????????????????????????????? 0.1 ??? 1,000
????20 kN 20 x 103 N ??????
20,000 N3.86 mm 3.86 x 10-3 m ??????
0.00386 m.8. ???????????????????????????????
???????? ???? ?????? 9. ?????????????????????
???? ???? ????????? 3.5 ?????? 3.5 Gm10.
????????????????????????????? ???????????????????
??????????????????????????????????
?????????????????????