NCERT Class 12 Chemistry Appendix II

Common Unit of Mass and Weight
1 pound = 453.59 grams
1 pound = 453.59 grams = 0.45359 kilogram
1 kilogram = 1000 grams = 2.205 pounds
1 gram = 10 decigrams = 100 centigrams
          = 1000 milligrams
1 gram = 6.022 × 1023 atomic mass units or u
1 atomic mass unit = 1.6606 × 10–24 gram
1 metric tonne = 1000 kilograms
        = 2205 pounds

Common Unit of Volume
1 quart = 0.9463 litre
1 litre = 1.056 quarts
1 litre = 1 cubic decimetre = 1000 cubic
centimetres = 0.001 cubic metre
1 millilitre = 1 cubic centimetre = 0.001 litre
             = 1.056 × 10-3 quart
1 cubic foot = 28.316 litres = 29.902 quarts
             = 7.475 gallons

Common Units of Energy
1 joule = 1 × 107 ergs
1 thermochemical calorie**
= 4.184 joules
= 4.184 × 107 ergs
= 4.129 × 10–2 litre-atmospheres
= 2.612 × 1019 electron volts
1 ergs = 1 × 10–7 joule = 2.3901 × 10–8 calorie
1 electron volt = 1.6022 × 10–19 joule
    = 1.6022 × 10–12 erg
    = 96.487 kJ/mol†
1 litre-atmosphere = 24.217 calories
     = 101.32 joules
     = 1.0132 ×109 ergs
1 British thermal unit = 1055.06 joules
      = 1.05506 ×1010 ergs
      = 252.2 calories

Common Units of Length
1 inch = 2.54 centimetres (exactly)
1 mile = 5280 feet = 1.609 kilometres
1 yard = 36 inches = 0.9144 metre
1 metre = 100 centimetres = 39.37 inches
     = 3.281 feet
     = 1.094 yards
1 kilometre = 1000 metres = 1094 yards
      = 0.6215 mile
1 Angstrom = 1.0 × 10–8 centimetre
      = 0.10 nanometre
      = 1.0 × 10–10 metre
      = 3.937 × 10–9 inch

Common Units of Force* and Pressure
1 atmosphere = 760 millimetres of mercury
     = 1.013 × 105 pascals
     = 14.70 pounds per square inch
1 bar = 105 pascals
1 torr = 1 millimetre of mercury
1 pascal = 1 kg/ms2 = 1 N/m2

Temperature
SI Base Unit: Kelvin (K)
K = -273.15°C
K = °C + 273.15
°F = 1.8(°C) + 32
C=F ° −32/1.8

Please refer to attached file for NCERT Class 12 Chemistry Appendix II