Various units and their relationship used in power plant

Energy Conversion :    1HP(Horse power) = 746 Watts = 0.746 Kilo Watts
1 Joule = 1 watt-second
1 kWh = 1 kW × 1 hr = 1000 watts × 3600 seconds
            = 36 × 105 joules =3,412 Btu = 860 kcal
            = 1Unit of electricity
1 Watt = 3.412 Btu/hour
1 Calorie = 4.184 Joules
1 kcal/Kg = 1.8 Btu’s/lb.
1 Btu = 252 Calories = 1,055 Joules
1 Million Btu = 293.1 kWh
1 Btu/lb. = 2.3260000 kJ/kg = 0.5559 Kilocalories/kg
1Chu ( Centigrade Heat Unit)= 1.8Btu = 1899 joules
1 Therm = 10,54,80,400 joules  = 100,000 Btu (British Thermal Units)

 Mass Conversion :       1 kgf (kilogram-force )= 9.8 N (Newtons)
1 lb = 0.45359237 kg
1 kg = 1000g = 2.20462262 lb

Pressure Conversion : 1 bar =  105 Pa(Pascal)  =  1.01 kg/cm2 
                                                          =  14.50 psi (pound per square inch)
1 kg/cm2  =  0.98 bar =  980.665 mbar (milli bar) =  98.06 kPa = 0.098 MPa
     =  10000 mmwc (mm of water column)
     =  735.56 mm-Hg  =  29 in-Hg
                          =  14.22 psi (lb/in2)
 1 atm (atmospheric pressure) =1.033kg/cm2 = 1.012bar

Temperature Conversion : Centigrade degrees = (5/9)  ×  (Fahrenheit degrees - 32)
   Fahrenheit degrees = (9/5)  ×  (Centigrade degrees) + 32
   Kelvin degrees = Centigrade degrees + 273

Volume Conversion : 1 gallon = 3.78541 litre
       1 m3  = 1000 litre

Length Conversion :    1 meter = 100 cm = 3.28084 feet = 1.09361 yard = 39.3701 inch
1 foot = 12 inch
1 yard = 36 inch = 3 feet
               1 inch = 2.54 cm 
1 mile = 1609.34 meter

Multipliers :    Mega = 106
Giga = 109
Tera = 1012
Centi = 10-2
Milli = 10-3
Micro =10-6
Nano = 10-9
Pico = 10-12

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