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1.长度单位: 1 in = 25.4 mm 1 ft = 0.3048 m
1 mile = 1609.3 m 1 micron =10-6 m
2. 质量单位: 1 lb = 453.6 1 cwt = 50.8 Kg 1 ton(imp) = 1016 Kg
1 top(up) = 907.2 Kg 1 tonne = 1000 Kg
3.力矩单位: 1 inlb = 0.113 Nm 1 ftlb = 1.356 Nm
1 kgm = 9.807 Nm 1 ft poundal = 0.0421 Nm
4.温度单位: (º F- 32) x 5/9 = º C
K-273.15 = º C
5.功及能量单位: 1 lbft = 1.356 J 1 Nm = 1 J
1 kgm = 9.807 J 1 kW/hr = 3.6 MJ
6.面积单位 1 in2 = 6.45 cm2 1 ft2 = 0.093 m2
7.压力单位:
1 psi = 6.89 kPa 1 kgf/cm2 = 98.07 kPa 1 bar = 100 kPa
1 bar = 14.5 psi
1 atmosphere = 98.1 kPa 1"(STANDARD) = 101.33 kPa
1 cm water = 97.89Pa 1 in water = 248.64 Pa
1 mm mercury = 133.3 Pa 1 in mercury = 3.39 kPa
1 Torr = 133.3 Pa 1 ft water = 0.0298 bar 1 bar = 33.33 ft water
8.体积单位:
1litre = 0.001 m3 1 cu.ft. = 0.0283 m3 1 cu.in.= 16.39 cm3 1 gal(imp) = 4.546 L 1 gal(us) = 3.79 L 1 fluid oz.(imp) = 28.41 mL 1 fluid oz.(us) = 29.57 mL 1 lbf = 4.45 N 1kgf = 9.81 N 1 kp(kilopond) = 9.81 N
1 poundal = 138.3 mN 1 ton force = 9.964 kM
10.功率单位(功/时间）: 1 lbft/sec = 1.356 W 1 kgm/sec = 9.807 W 1Nm/sec = 1 W
1 Nm/sec = 1 W 1 Joule/sec = 1 W 1 H.P.(imp) = 745.7 W
1.流量单位: Cv值：水流量(US gal/min)于60º F下，流经差压为1psi之阀门而所得出之流量定值。（ Cv X 1000=l/min )
kv值：水流量 (L/ min)于20º F下，流经差压为1kgf/cm2之阀门而所得出之流量定值。
KV值: 水流量 (m3/ min)于20º F下，流经差压为1kgf/cm2之阀门而所得出之流量定值。
S值：气动元件有效截面积（mm2)
流量系数之间的转换：
CV = 1.17 KV S = 18.45 CV
S.T.P = 标准温度及压力 （0 º C 及101.3 kPa绝对压力）
N.T.P = 正常温度及压力 （20 º C 及101.3 kPa绝对压力）
M.S.C = 公制标准情况 （15 º C 及101.3 kPa绝对压力）
ANR = 温度 ：20 °C及相对湿度：65%
12.等值换算: 单 位 缩 写 单 位 缩 写
Pascal Pa Newton N
metre m litre L
Watt W Newton metre Nm
Joule J Megajoule MJ
° Kelvin K
13.单位缩写:
1 psi = 6.895 kPa =0.07 kg/cm2 = 0.06895 bar = 0.0703 atm
1 standard atmosphere = 14.7 psi = 101.3 kPa = 1.01325 bar
1 kg/cm2 = 98.07 kPa = 14.22 psi = 28.96 ins mercury
1 ft lb = 0.13826 kgm = 1.356 Nm
1 L = 1000 cm3 = 1.7598 pint = 106 mm3
1 tonne = 1000 kg = 0.984 ton = 2205 lb
1 m3 = 106 cm3
1 cu ft/min = 0.0283 m3/min = 28.3 l/min
1 Pa = 1 N/m2
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