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長(zhǎng)度單位
1 in = 25.4 mm
1 ft = 0.3048 m
1 micron = 0.001 mm

面積單位
1 in2 = 6.45 cm2
1 ft2 = 0.093 m2

體積單位
1 litre = 0.001 m3
1 cu.ft. = 0.0283 m3
1 cu.in. = 16.39 cm3
1 fluid oz.(imp) = 28.41 mL
1 fluid oz.(us) = 29.57 mL
1 gal(imp) = 4.546 L
1 gal(us) = 3.79 L

溫度單位
(°F-32)X5/9=℃
K-273.15 = ℃

功及能量單位
1 Nm = 1 J
1 kgm = 9.807 J
1 kW/hr = 3.6 MJ
1 lbft = 1.356 J

功率單位
1 Nm/sec = 1 W
1 lbft/sec = 1.356 W
1 kgm/sec = 9.807 W
1 Joule/sec = 1 W
1 H.P.(imp) = 745.7 W

質(zhì)量單位
1 lb = 453.6 g
1 tonne = 1000 kg
1 ton(imp) = 1016 kg
1 ton(us) = 907.2 kg

流量計(jì)算公式
Q = Cv值 X 984 =
Kv值 X 1100 Cv = So ÷ 18

力單位
1 kgf = 9.81 N
1 lbf = 4.45 N
1 kp(kilopound) = 9.81 N
1 poundal = 138.3 mN
1 ton force = 9.964 kM

力矩單位
1 kgm = 9.807 Nm
1 ft. poundal = 0.0421 Nm
1 in lb = 0.113 Nm
1 ft lb = 1.356 Nm

壓力單位
1 psi = 6.89 kPa
1 kgf/cm2 = 98.07 kPa
1 bar = 100 kPa
1 bar = 14.5 psi
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 = 3.33 ft water
1 atmosphere = 101.3 kPa
1 cm water = 97.89 Pa
1 in water = 248.64 Pa

換算表
1psi=6.895kPa=0.07kg/cm2=0.06895bar=0.0703atm 1standard atmosphere=14.7psi=101.3kPa=1.01325bar
1kgf/cm2 = 98.07kPa=14.22psi = 28.96ins mercury
1m3 = 1000000cm3
1cu ft/min = 28.3 l/min
1Pa = 1N/m2
1ft lb = 0.13826kgm = 1.356 Nm
1 L = 1000cm3 = 1.7598pint = 1000000mm3
1 tonne = 1000 kg = 0.984 ton = 2204.6 lb

流量
Cv值 = 水流量（US gal/min）于60°F下，流經(jīng)壓差為 1 psi 之閥門而所得出之流量定值。
Kv值 = 水流量（L/min）于20℃下，流經(jīng)壓差為 1 kgf/cm2 之閥門而所得出之流量定值。
So = 有效截面積（mm2）
Q = 流量（Ng/min）
S.T.P. = 標(biāo)準(zhǔn)溫度及壓力（0℃及101.3kPa壓力）
N.T.P. = 正常溫度及壓力（20℃及101.3kPa壓力）
M.S.C. = 公制標(biāo)準(zhǔn)情況（15℃及101.3kPa壓力）
AMR = 溫度：20℃及相對(duì)濕度：65%