在线课程

单位换算

发布时间:2020-7-20 10:03:26 点击:

1、长度单位[TOP↑]
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[TOP↑]
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[TOP↑]
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[TOP↑]

(o F- 32) x 5/9  =    o C

  K-273.15  =   o C

5、功及能量单位[TOP↑]
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[TOP↑]
1 in2  =  6.45 cm2 1   ft2 = 0.093 m2

7、压力单位[TOP↑]
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[TOP↑]
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  

9、力单位[TOP↑]
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)[TOP↑]
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

11、流量单位[TOP↑]
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[TOP↑]
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

13、单位缩写[TOP↑]
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