INTRODUCTION TO SI UNITS
CONVERSION FACTORS
1. Force :
1 newton = kg-m/sec2 = 0.012 kgf
1 kgf = 9.81 N
2. Pressure :
1 bar = 750.06 mm Hg = 0.9869 atm = 105 N/m2 = 103 kg/m-sec2
1 N/m2 = 1 pascal = 10–5 bar = 10–2 kg/m-sec2
1 atm = 760 mm Hg = 1.03 kgf/cm2 = 1.01325 bar = 1.01325 × 105 N/m2
3. Work, Energy or Heat :
1 joule = 1 newton metre = 1 watt-sec
= 2.7778 × 10–7 kW-h = 0.239 cal
= 0.239 × 10–3 kcal
1 cal = 4.184 joule = 1.1622 × 10–6 kWh
1 kcal = 4.184 × 103 joule = 427 kgf m
= 1.1622 × 10–3 kWh
1 kWh = 8.6042 × 105 cal = 860 kcal
= 3.6 × 106 joule
1 kgf-m = 1/427 kcal=9.81 joules
4. Power :
1 watt = 1 joule/sec = 0.860 kcal/h
1 h.p. = 75 m kgf/sec = 0.1757 kcal/sec = 735.3 watt
1 kW = 1000 watts = 860 kcal/h
5. Specific heat :
1 kcal/kg-°K = 0.4184 joules/kg-K
6. Thermal conductivity :
1 watt/m-K = 0.8598 kcal/h-m-°C
1 kcal/h-m-°C = 1.163 watt/m-K = 1.163 joules/s-m-K.
7. Heat transfer co-efficient :
1 watt/m2-K = 0.8598 kcal/m2-h-°C
1 kcal/m2-h-°C = 1.163 watt/m2-K.
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