Millikan’s Oil Drop Experiment

Millikan’s Oil Drop Experiment

Millikan’s Oil Drop Experiment or Determination of charge of electron is conduct by an American Scientist R.A.Millikan, who perform an experiment on the charge on oil drops. R.A.Millikan perform several experiments to calculate charge on oil drops and he gets every time its value equal to -1.6×10-19 coulomb.When these results associated with results of cathode rays then conclude that charge present on particle of cathode rays is -1.6×10-19 coulomb.

Calculation of mass of electron

As we  know e/m = -1.76×108 coulombs/gram
                          e = -1.6×10-19 coulomb
              (e/m)/e = (-1.76×108)/(-1.6×10-19)
                       m = 9.102×10-28 gram
                       m = 9.102×10-31 kilogram

Mass of electron in comparison with atom

Mass of electron in comparison with atom is described below-
Mass of 1 mole of Hydrogen = 1.008gms
Number of hydrogen atom in 1 mole = 6.023×1023
Mass of 1 atom of hydrogen = 1.008/6.023×1023
                                             = 1.67×10-27kg
Mass of electron is 9.109×10-31
                         =  Mass of 1 atom of hydrogen/Mass of electron
                         = (1.67×10-27)/(9.109×10-31) = 1837
     Mass of an electron is 1/1837 th the mass of a hydrogen atom. 
for more chemistry notes related to these topics visit at

Related Posts

Latest Posts

Pharmaceutical Manufacturing Abbreviations

Abbreviations used in Pharmaceutical Manufacturing

Abbreviations used in Pharmaceutical Manufacturing As we know pharmaceutical manufacturing products i.e. medicines, life saving drugs have very high importance in our life. Today we learn about various abbreviations used in pharmaceutical manufacturing process steps or simply in pharmaceutical manufacturing companies.Read More…

Chemistry Tutor Chemistry Notes Info at new Web Address

Chemistry Notes Info _ Your Chemistry Tutor for Innovative Education

Welcome to new Chemistry Notes Info website Welcome Friends… Your chemistry tutor move from to This is just a welcome post especially from your Chemistry Tutor i.e. Chemistry Notes Info. Dear friends finally now we move our ChemistryNotesInfoRead More…

Leave a Reply to

%d bloggers like this: