Chemistry -Important One Liners For Competitive Exams

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Conversion Factors

 

 

 
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 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 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 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

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