1, length unit:

1 inch (in) = 0.0254 m 1 mile (me) =1609.35m.

1 ft = 0.3048m1micron (μm) = 10-6 m.

2. Area unit:

1 in2 = 6.452× 10-4 m2 1 mi2 = 2.59× 106 m2

1 ft2 = 0.0929 m2 1 km2 = 106 m2

3. unit of volume:

1 l (L,dm3) = 10-3 m3

1in3 = 0.01639l1usgal = 3.78543l.

1FT3 = 28.317 l1UK gal = 4.54374l.

1 American quart (qt) = 0.94636 L 1 American barrel (bbl, petroleum) =158.98L.

4, quality unit:

1 Newton (N) = 0. 102 kg 1 lb = 0.454kg.

5. Pressure unit:

1 kgf/cm2 = 0.0981MPa1mm water column (mmh2o) = 9.81×10-6mpa.

1 bar = 0.1MPa1mmhg =1.333x10-3mpa.

1 ATM = 0.1013 MPa1inch water column (inH2O) = 2.49× 10-4 MPa.

1 lb/in2 (psi, lb/in2) = 6.89×10-3mpa1foot water column (ftH2O) = 2.984× 10-3 MPa.

1 oz/in2 (ozf/in2) = 4.31×10-4 MPa1inch of mercury (inHg) = 3.386× 10-3 MPa.

6. degree-day:

- 32)×5/9 = ℃ K - 273. 15 = ℃

7. Flow unit:

7. 1 volume flow unit

1 m3/h = 0.0 1667 m3/min 1 UKgal/min = 4.546× 10-3 m3/min

1 L/min = 10-3 m3/min 1 USgal/min = 3.785× 10-3 m3/min

1FT3/h = 4.719×10-4m3/min1American barrels per day (bbl/d) =1.104×/kloc.

7.2 Mass flow unit

1 kg/h = 0.0 1667 kg/min 1 lb/h = 7.56× 10-3 kg/min

Cv value: the water flow rate (US gal/min) is 60? , through the valve with differential pressure of 1psi. (Cv× 1000=l/min)

Kv value: the water flow (L/min) is 20? Below, through the valve with differential pressure of 1kgf/cm2, the flow rate is fixed.

KV value: the water flow (m3/min) is 20? Below, through the valve with differential pressure of 1kgf/cm2, the flow rate is fixed.

S value: effective sectional area of pneumatic components (mm2)

S.T.P = standard temperature and pressure (0℃ and 10 1.3 kPa absolute pressure).

N.T.P = normal temperature and pressure (20℃ and 10 1.3 kPa absolute pressure).

M.S.C = metric standard case (15℃ and 10 1.3 kPa absolute pressure).

ANR = temperature: 20℃ and relative humidity: 65%

Conversion between discharge coefficients: cv =1.17kv s =18.45cv.

8, concentration unit:

1μ g/m3 =10-3mg/m31ppm (by weight) = 1. 198 mg/m3.

1lb/FT3 =1.6108×107 mg/m31ppm (at 20℃ by volume 20℃) = M (molecular weight) /22.4 mg/m3.

9, density unit:

1 lb/in3 = 2.768× 10-4 kg/m3(g/L) = 27.68 g/cm3 1 lb/UKgal = 99.8 kg/m3(g/L) = 0.0998 g/cm3

1 lb/ft3 = 16.02 kg/m3(g/L) = 0.0 1602 g/cm3 1 lb/USgal = 1 19.8 kg/m3(g/L) = 0. 1 198 g/cm3

10, humidity unit:

Dew point℃ Absolute humidity g/m3 Volume ratio ppmv Weight ratio (in air) ppmw Relative humidity (20℃)%

-70 0.00207 2.5 1.64 0.00 1

-60 0.00857 1 1 6.59 0.005

-50 0.03 12 39 24.2 0.02

-40 0. 102 127 79. 1 0.05

-30 0.30 1 376 134 0.2

-20 0.8 16 1020 635 4

- 10 2.06 25602 1590 1 1

0 4.84 6020 3800 26

10 9.2 1 12 100 7729 52

20 18.5 23 100 100

30 36.6 4 1800

40 58.5 73000

1 1, thermal and work units:

1 Calit = 4.1868j (n? M) energy [quantity], work, heat: SI unit name? Coke [ear]

1 thermochemical card (calth) = 4. 1840 J power, radiation [energy] flux: SI unit name? Watt [special]

1 20℃ cal20 = 4.1816 j specific heat capacity: SI unit name? Joules [watts] per kilogram kelvin

1 15℃ card (cal15) = 4.1855j1kcal/kg? ℃[kcalIT/(kg? ℃)]=4 186.8 J/(kg? K)

1 british thermal unit (btu) =1.05506x103j1kcalth/(kg? ℃) = 4 184 J/(kg? K)

1 kw? When (kw? h) = 3.6× 106 J 1 Btu/(lb? ) = 4 186.8 J/(kg? K)

1 kg force? M/s (kgf? m/s)=9.80665W=9.80665N? M/s heat transfer coefficient: SI unit name? Watts per square meter kelvin

1 metric horsepower (PS) = 7.35499×102 w1kcalit/(cm2? ℃) = 4. 1868× 107 W/(m2? K)

1 British horsepower (PS) = 745.7 W thermal conductivity: SI unit name? Watt [tex] kelvin per meter

1 foot? Pound force per second (ft? lbf/s) = 1.35582 W 1 kcalIT/(cm? ℃) = 4. 1868× 105 W/(m? K)

12, force unit:

1 kg force (kgf, KP, kilopond) = 9.80665n1pound (PDL, pound al) = 4.44822n.

1 lbf = 4.448n1dyne =10-5n.

13, viscosity unit:

13. 1 dynamic viscosity η unit

1 kgf? s/m2 = 9.8 1 kg/(m? s) = 9.8 1 Pa? s 1 g/(cm? S)[ berth, P] = 0. 1 Pa? s

1 kg/(m? h) = 2.778× 10-4 Pa? s 1 g/(m? S)[ centipoise, cP] = 10-3 Pa? s

1 lb/(ft? s) = 1.488 Pa? s 1 lbf? s/ft2 = 47.88 Pa? s

13.2 kinematic viscosity nu unit

υ = η/ρ υ-cSt(mm2/s),η- 10-3 Pa? s= 1cP,ρ-g/cm3 1 m2/h = 2.778× 10-4 m2/s

1 cm2/s (s, ST) =10-4m2/s1ft2/s = 9.29×10-2m2/s.

1 mm2/s (centimetres, CST) =10-6m2/s1ft2/s = 2.58×10-5m2/s.

13, electronic unit of measurement:

Charge [quantity]? Coulomb c, current? Ampere I, potential (pressure, potential)? Volt [special ]V, resistance [(inductance, capacitance, electricity, impedance) reactance]? Ohm ω,

Resistivity? M ω? M, temperature coefficient of resistance? ℃- 1, inductance? Enjoy [benefit ]H, capacitance? Fa [La ]F, frequency? Hertz Hz, period? Seconds s,

Active power? Watt [special ]W, reactive power? Lack of var, apparent power? Voltammetric VA, power factor? Cosφ, energy [work, heat]? Coke [watt ]J

Magnetic energy? Weber Wb, magnetic flux density [magnetic induction intensity]? T, permeability? Enjoy [profit/meter H/m, Newton n, torque? Mi n? m

1a =103ma =106μ a1Maxwell (Mx) = 10-8 Wb.

1f =106 μ f =1012 pf1Gaussian (g) =10-4 t.

1m =106mm2/m1electron volt (EV) =1.60207×10-19 J.