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ICS 01.060 ISBN 978-974-292-378-5

SI UNITS AND RECOMMENDATIONS FOR THE USE OF THEIR

MULTIPLES AND OF CERTAIN OTHER UNITS

THAI INDUSTRIAL STANDARD

. 230 2550

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. 230 2550

6 10400

0 2202 3300

124179192550

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(2)

244

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(3)

15 .. 2511

.230-252094

95 11 2520 .230-2527 101152 252527- (ComiteInternational des Poids et

Mesures, CIPM) .. 2523 (.. 1900)- .235 9 10 12 13.- .

ISO 1000 : 1992 SI units and recommendations for the use of their multiples and of certain

Amendment 1:1998 other units

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(5)

3769 (.. 2550 )

.. 2511

.2302527

15 .. 2511

837 (.. 2527).. 2511 4.. 2527.230-2550

24 .. 2550

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-1-

. 230-2550

1. 1.1

) (2. 3. 5.)) (4.

6. .)) SI (.)

2. (Systeme International d Unites) SI(Conference Generale des Poids et Mesures,CGPM)11 .. 2503 (..1960) - (base unit)- (derived unit)

2.1 SI 7 1

|\

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1(2.1)

.

2.2 SI (m/s) SI CGPM 23 SI (dimensionless)(1)1 (rad) (sr)

1 SI (rad/s) SI (electric dipole moment)c m A s m. . .

(length) (metre) m

(mass) (kilogram) kg

(time) (second) s

(electric current) (ampere) A

(kelvin) K

(thermodynamic temperature)

(amount of substance) (mole) mol

(candela) cd

(luminous intensity)

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2(2.2)

.

.

.

.

.

(plane angle) (radian) rad 1 rad = 1 m/m =1

(solid angle) (steradian) sr 1 sr = 1 m2/m2= 1

(frequency) (hertz) Hz 1 Hz = 1 s-1

(force) (newton) N 1 N = 1 kg m/s2

(pressure), (pascal) Pa 1 Pa = 1 N/m2

(stress)(energy), (joule) J 1 J = 1 N m

(work),

(quantity of heat)

(power), (watt) W 1 W = 1 J/s

(radiant flux)

(electric charge), (coulomb) C 1 C = 1 A s

(quantity of electricity)

(electric potential), (volt) V 1 V = 1 W/A

(potential difference),(tension),

(electromotive force)

(capacitance) (farad) F 1 F = 1 C/V

(electric resistance) (ohm) 1 =1 V/A

(electric conductance) (siemens) S 1 S = 1 -1

(magnetic flux) (weber) Wb 1 Wb = 1 V s

(magnetic flux density) (tesla) T 1 T = 1 Wb/m2

(inductance) (henry) H 1 H = 1 Wb/A

(Celsius temperature) 1) (degree Celsius) oC 1oC = 1 K

(luminous flux) (lumen) lm 1 lm = 1 cd sr

(illuminance) (lux) lx 1 lx = 1 lm/m2

1) (.5 6. .)

SISI

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3(2.2)

3. SI4SI () (compound unit)

1 cm3 = (10-2 m)3 = 10-6 m3

1 s-1 = (10-6 s)-1 = 106 s-1

1 mm2/s = (10-3 m)2/s = 10-6 m2/s

nm mm 1. SI

(mg)(kg)

SI SI

(activity of a radionuclide) (becquerel) Bq 1 Bq = 1 s-1

(absorbed dose), (gray) Gy 1 Gy = 1 J/kg

(specific energy imparted),

(kerma),

(absorbed dose index)

(dose equivalent), (sievert) Sv 1 Sv = 1 J/kg(dose equivalent index)

SI

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4SI(3.)

4. SI SI4.1 SI

4.2 0.1 1 000

2 3

1024

(yotta) Y

1021

(zetta) Z

1018

(exa) E

1015

(peta) P

1012

(tera) T

109

(giga) G

106

(mega) M

103

(kilo) k

102

(hecto) h

10 (deca) da

10-1

(deci) d

10-2 (centi) c

10-3

(milli) m

10-6

(micro)

10-9

(nano) n

10-12

(pico) p

10-15

(femto) f

10-18

(atto) a

10-21

(zepto) z

10-24

(yocto) y

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1.2 104 N 12 kN0.003 94 m 3.94 mm1 401 Pa 1.401 kPa3.1 10-8 s 31 ns

0.1 1 000

4.3 4.4 SI 10

5. 5.1 ()

m s A Wb

5.2 N m N m

2. 3. (Nm)

mN

m m/s ms-1

s

(/)

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6. SI SI SI

6.1 SI 5 6

(Comite International des Poids et Mesures, CIPM) 6.2 4 5 6

(ml) (. 6)6.3 5 6 SI

SI kg/h km/h (. 5 6) 4. SI CIPM .

7 (*)

5SI(6.)

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-8-

. 230-2550

6SI(6.)

(electronvolt)

eV 1 (kinetic energy) 1

1 eV 1.602 177 x 10-19

J

u 1 1/12

(unified atomic mass 12C

unit) 1 u 1.660 540 x 10-27

kg

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-9-

. 230-2550

.SI

(1.1.))

SI SISI.1 ( ) SI

.1 SI

180

160

160

200

SI CIPM

SI SI

.235

SI 5

1 2 3 4 5 6 7

1 (space and time)

1-1

()

rad

()

[(gon)

(grade)]

(angle, 1 = rad

plane angle) ()

1= rad

mrad

()

1 =

()

1=

rad

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SI CIPM

SI SI

.235

SI

5

1 2 3 4 5 6 7

1-2 (solid angle)

sr

1-3.1 km 1* (nautical mile)

(length) m = 1 852 m

() cm ()

mm * CIPM

m

nm

pm

fm

1-4 km2 ha* (hectare : )

(area) m2

1 ha = 104m

2

dm2

a* (are : )

cm2

1 a = 102m

2

mm2

* CIPM

1-5 m3 .. 2507 (.1964)

CGPM

(volume) hl (l)

1 hl = 10-1

m3

dm3

l, L (dm3)

()

1 l =

10-3

m3= 1)5

1 dm3

cl

1 cl = 10-5

m3

cm3

ml

1 ml = 10-6

m3= 1 cm

3

mm3

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1

3.6

SI CIPM

SI SI

.235

SI 51 2 3 4 5 6 7

1-7 d

(time) () (a)

1 d = 24 h

(time interval) ()

h

(duration) ()

1 h = 60 min

()ks

min

()

1 min = 60 s

()

s

()

ms

s

ns

1-8

(angular

velocity)

rad/s

1-10 m/s 1 * (knot) = 1.852 km/h

(velocity) km/h ()

1 km/h = m/s = 0.514 444 m/s

1-7

m/h * CIPM

1-11.1 m/s2

(acceleration)

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SI CIPM

SI SI

.235

SI 51 2 3 4 5 6 7

2 (periodic and related phenomena)

2-3.1 THz

(frequency) GHz

MHz

kHz

Hz

()

2-3.2 s-1 (r/min) (rotational min

-1 (r/s)

frequency)

(IEC 27-1)

1-7

2-4 rad/s

(angular

frequency)

3 (mechanics)

3-1 Mg t 2)5

(mass) ()

1 t = 103kg

kg

()

g

mg

g

3-2 Mg/m3 t/m3kg/l g/ml 1-5

(volumic mass, 3-1 density, kg/dm

3

mass density)

g/cm3

kg/m3

g/l

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. 230-2550

.

.

.

.

.

.

.

.

SI CIPM

SI SI

.235

SI

5

1 2 3 4 5 6 7

3-5 kg/m 1 (tex) = 10-6kg/m

mg/m = 1 g/km

(lineic mass,

linear density)

3-7 kg m2

(moment of

inertia)

3-8 (momentum)

kg m/s

3-9.1 MN

(force) kN

N

()

mN

N

3-11 kg m2

/s

(moment of

momentum)

(angular momentum)

3-12.1 MN m

(moment of force) kN m

N m

mN m

N m

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.

. .

SI CIPM

SI SI

.235

SI 51 2 3 4 5 6 7

3-15.1 GPa * (bar), 1 bar = 100 kPa

(pressure) MPa ()

kPa 1 mbar = 1 hPa

hPa

Pa

() * CIPM

mPa

Pa3-15.2 GPa

(normal stress) MPa

kPa

Pa

3-23 Pa s P [(poise)]

(viscosity) mPa s 1 cP = 1 mPa s

(dynamic viscosity) CGS

SI

3-24 m2/s St (stokes)

(kinematic viscosity) mm2/s 1 cSt = 1 mm

2/s

3-23

3-25

N/m

(surface tension) mN/m

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. 230-2550

o

o

o

SI CIPM

SI SI

.235

SI 5

1 2 3 4 5 6 7

3-26.1 EJ

(energy) PJ

3-26.2 TJ

(work) GJ

MJ

kJ

J

()

mJ

3-27 GW

(power) MW

kW

W

()

mW

W

4 (heat)

4-1 K

()

(thermodynamic

temperature)

4-2 C t

(Celsius ( (TT )

temperature) )

TT T

= 273.15 K ()

(C) .5 6.

.

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.

.

.

SI CIPM

SI SI

.235

SI 51 2 3 4 5 6 7

4-3.1 K-1

4-2

(linear

expansion

coefficient)

4-6 EJ

(heat) PJ

TJ

GJ

MJ

kJ

J

mJ

4-7 kW

W

(heat flow rate)

4-9 W/(m K)

(thermal 4-2

conductivity)

4-10.1 W/(m2 K)

4-2

(coefficient of

heat transfer)

4-11 m2 K/W

(thermal 4-2

insulance)

4-15 kJ/K

(heat capacity) J/K 4-2

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. 230-2550

.

.

.

.

.

.

SI CIPM

SI SI

.235

SI 51 2 3 4 5 6 7

4-16.1 kJ/(kg K)

kJ/(kg K) 4-2

(massic heat

capacity)

4-18 kJ/K

(entropy) J/K 4-2

4-19 kJ/(kg K)

(massic J/(kg K) 4-2

entropy)

4-21.2 MJ/kg

kJ/kg

(massic thermo- J/kg

dynamic energy)

5(electricity and magnetism)

5-1 kA

(electric current) A

() mA

A

nA

pA

5-2 A h 1-7

(electric charge) 1 A h = 3.6 kC

kC

(quantity of C

electricity) ()

C

nC

pC

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. 230-2550

SI CIPM

SI SI

.235

SI 51 2 3 4 5 6 7

5-3 C/mm3

(volumic charge, GC/m3

volume density MC/m3

of charge,

charge density) C/cm3

kC/m3

C/m3

mC/m3

C/m2

5-4 MC/m2

(areic charge, C/mm2

surface density C/cm

2

of charge) kC/m2

C/m2

mC/m2

C/m2

5-5 MV/m

kV/m

(electric field

strength) V/mm

V/cm

V/m

mV/m

V/m

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SI CIPM

SI SI

.235

SI 51 2 3 4 5 6 7

5-6.1 MV

(electric kV

potential) V

5-6.2 () mV

(potential V

difference)

(tension)

5-6.3

(electromotive

force)

5-7 C/cm2

kC/m2

(electric flux density) C/m2

mC/m2

C/m

2

5-8 MC

(electric flux) kC

C

mC

5-9 F

(capacitance) () mF

F

nF

pF

5-10.1 F/m

(permittivity) F/m

nF/m

pF/m

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SI CIPM

SI SI

.235

SI 51 2 3 4 5 6 7

5-13 C/cm2

(electric kC/m2

polarization) C/m2

mC/m2

C/m2

5-14 C m

(electric dipole

moment)

5-15 MA/m2

(areic electric A/mm2

current, A/cm2

electric current kA/m2

density) A/m2

5-16 kA/m

(lineic electric A/mm

current, A/cm

linear electric A/m

current

density)

5-17 kA/m

(magnetic field A/mm

strength) A/cm

A/m

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.

.

.

SI CIPM

SI SI

.235

SI 51 2 3 4 5 6 7

5-27 A m2

(magnetic moment),

electromagnetic

moment)

5-28 kA/m

(magnetization)

A/mm

A/m

5-29 T

(magnetic mT

polarization)

(IEC N m2/A

27-1 :

1971, (magnetic Wb m

dipole

86 moment)

5-33 G

() M

[resistance (to k

direct current)]

()

m

5-34 ( kS

) S

[conductance ()

(of direct mS

current)] S

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.

.

.

.

.

.

.

.

.

..m

SI CIPM

SI SI

.235

SI

5

1 2 3 4 5 6 7

5-36 G m mm2(=10-6 m

(resistivity) M m = m)

k m

m.

m

m m

m

n m

5-37 MS/m

(conductivity) kS/m

S/m

5-38 H-1

(reluctance)

5-39 H

(permeance)

5-44.1 M

(impedance) k

m

(complex

impedance)

5-44.2

(modulus of

impedance)

(impedance)

5-44.3

(resistance)

5-44.4

(reactance)

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SI CIPM

SI SI

.235

SI 5

1 2 3 4 5 6 7

5-45.1 kS

(admittance), S

mS

S

(complex

admittance)

5-45.2

(modulus of

admittance)

(admittance)

5-45.3

(conductance)

5-45.4

(susceptance)

5-49 TW

(active power) GW

MW (W) (apparent

kW power) W (volt ampere)

mW (var)

W

nW

5-52 TW h 1-7

(active energy) GW h

TJ

MW h

GJ

kW h

MJ

W h

1 W h = 3.6 kJ

kJ ()

J

.

.

.

.

.

.

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.

.

. ..*

SI CIPM

SI SI

.235

SI

5

1 2 3 4 5 6 7

6 (light and related electromagnetic radiation)

6-3 m A [(angstrom)]

(wavelength) m 1 A = 10-10

m

nm = 10-1

nm = 10-4

m

pm *CIPM

6-7 J

(radiant energy)

6-10 W

(radiant power)

(radiant energy

flux)

6-13 W/sr

(radiant

intensity)

6-14 W/(sr m2)

(radiance)

6-15 W/m2

(radiant

exitance)

6-16 W/m2

(irradiance)6-29 cd

()

(luminous

intensity)

.

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.

.

.

.

.

SI CIPM SI SI .235

SI 5

1 2 3 4 5 6 7

6-30 lm ()(luminous flux)

6-31 lm h 1-7

(quantity of 1 lm h =

light) 3 600 lm s

()lm s

6-32 cd/m2

(luminance

6-33 lm/m2

(luminous exitance)

6-34 lx(illuminance) ()

6-35 lx s(light exposure)

6-36.1 lm/W(luminous

efficacy)

7 (acoustics)7-1 (period), s

ms

(periodic time) s

7-2 MHz(frequency) kHz

Hz

7-5 m(wavelength) mm

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SI CIPM

SI SI

.235

SI 51 2 3 4 5 6 7

7-8 kg/m3

(volumic mass,

mass density,

density)

7-9.1 Pa

(static pressure) mPa

Pa7-9.2

()

(instantaneous

sound pressure)

7-11 m/s

mm/s

()

(instantaneous

sound particle

velocity)

7-13 m3/s

()

(instantaneous

volume flow

rate)

7-14.1 m/s

(velocity of

sound)

7-16 kW

(sound power) W

mW

W

pW

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.

.

SI CIPM SI SI .235

SI 51 2 3 4 5 6 7

7-17 W/m2

(sound intensity) mW/m2

W/m2

pW/m2

7-18 Pa s/m3

(acoustic

impedance)

7-19 N s/m(mechanical

impedance)

7-20.1 Pa s/m (surface density

of mechanical

impedance)

7-21 B ()

dB (),

(sound pressure level) 1 dB = 10-1

B

7-22 B

(sound power level) dB

7-28 B

dB(sound reduction index)

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.

SI CIPM

SI SI

.235

SI

5

1 2 3 4 5 6 7

7-29 m2

(equivalent

absorption

area of a

surface or

object)

7-30 s

(reverberation

time)

8 (physical chemistry and molecular physics)

8-3 kmol

(amount of mol

substance) ()

mmol

mol

8-5 kg/mol

(molar mass) g/mol

8-6 m3/mol 1-6

(molar volume) dm3/mol l/mol

cm3/mol

8-7 kJ/mol

J/mol

(molar thermo

dynamic

energy)

8-8 J/(mol K)

4-2

(molar heat capacity)

8-9 J/(mol K)

(molar entropy) 4-2

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SI CIPM

SI SI

.235

SI 51 2 3 4 5 6 7

8-13 mol/dm3 mol/l 1-6

B

(concentration kmol/m3

of B) mol/m3

B

(amount of

substance

concentration

of B)

8-16 mol/kg

B mmol/kg

(molality of

solute B)

8-39 m2/s

(diffusion

coefficient)

8-41 m2/s

(thermal

diffusion

coefficient)

9 (atomic and nuclear physics)

9-28.2 kg

(mass defect)

(

)

1 u

1.660 540 x

10-27

kg

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..*

SI CIPM

SI SI

.235 SI 5

1 2 3 4 5 6 7

9-33 MBq Ci* [(curie)]

(activity) kBq 1 Ci = 3.7 1010

Bq

Bq ()

* CIPM

9-34 MBq/kg

(massic activity), kBq/kg

(specific activity) Bq/kg

9-37 d a ()

(half-life) h

s 1-7

ms

10 (nuclear reactions and ionizing radiations)

10-1 J

(reaction energy) GeV

MeV

keV

eV

()

1 eV

1.602 177 x

10-19

J

10-51.2 Gy * [rad* (rad)]

(absorbed dose) mGy 1 rad = 10

-2

Gy* CIPM

10-52 Sv * [rem* (rem)]

(dose equivalent) mSv 1 rem = 10-2

Sv

* CIPM

10-58 C/kg R (roentgen)

(exposure) mC/kg 1 R = 2.58 x 10-4

C/kg

()

* CIPM

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SI CIPM

SI SI

.235

SI 51 2 3 4 5 6 7

12 (characteristic number)

12-1 1

(Reynolds number) Re= 1.32 x 103

12-6 1

(Mach number)

13 (solid state physics)

13-17 eV-1/m3

(density of state) J-1

/m3

10-1

13-20 m3/C

(Hall coefficient)

13-21 V

mV

(thermo-electromotive

force)

13-24 V/K

(Thomson coefficient) mV/K 4-2

13-28.2 J (gap energy) fJ 10-1

aJ

eV

13-36.1 K

(Curie temperature) 4-2

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.SI

(1.1 ))

.1 1/299 792 458 [CGPM 17 .. 2526 (.. 1983) 1]

metre : The metre is the length of the path travelled by light in vacuum during a time interval of

1/299 792 458 of a second.

.2

[CGPM 1 .. 2444 (.. 1901)]kilogram : The kilogram is the unit of mass ; it is equal to the mass of the international prototype of the

kilogram.

.3 9 192 631 770 133[CGPM 13 .. 2510 (.. 1967) 1]

second : The second is the duration of 9 192 631 770 periods of the radiation corresponding to the

transition between the two hyperfine levels of the ground state of the cesium133 atom.

.4 2 1 2 x 10-71 [CGPM .. 2489 (.. 1946) 2 CGPM 9 .. 2491 (.. 1948)]

ampere : The ampere is that constant electric current which, if maintained in two straight parallel

conductors infinite length, of negligible circular crosssection, and placed 1 metre apart in vacuum

would produce between these conductors a force equal to 2 x 10

-7

newton per metre of length.

.5 1/273.16 [CGPM 13 .. 2510 (.. 1967) 4]5. CGPM 13 .. 2510 3 K

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6. ( T) (t) (t = T-To) To= 273.15 K

kelvin : The kelvin, unit of thermodynamic temperature, is the fraction 1/273, 16 of the thermodynamic

temperature of the triple point of water.

NOTES

5 The 13th CGPM (1967), Resolution 3 also decided that the unit kelvin and its symbol K should be used

to express an interval of a difference of temperature

6 In addition to the thermodynamic temperatrue (symbol T), expressed in kelvins, use is also made of

Celsius temperature (symbol t) difined by the equation t = TTo, where To= 273.15 K by definition. To

express Celsius temperature, the unit degree Celsius, which is equal to the unit kelvin, is used ; in this

case, degree Celsius is a special name used in place of kelvin. An interval of difference of Celsius

temperature can, however, be expressed in kelvins ad well as in degrees Celsius.

.6 12 0.012 12 [CGPM 14 .. 2514 (.. 1971) 3]

mole : The mole is the amount of substance of a system which contains as many elementary entities as

there are atoms in 0.012 kilogram of carbon 12. When the mole is used, the elementary entities must

be specified and may be atoms, molecules, ions, electrons, other particles, of specified groups of such

particles.

.7 540 x 10

121/683

[CGPM 16 .. 2522 (.. 1979) 3]

candela : The candela is the luminous intensity in a given direction of a source which emits monochromatic

radiation of frequency 540 x 1012hertz and of which the radiant intensity in that direction is 1/683

watt per steradian.