Millikan used his famous oil drop technique to determine the charge on an electron. In this experiment, an air containing chamber is injected with an oil spray consisting of microscopic droplets produced by an atomizer. The air is exposed to X-rays and ionized. This ionization ...

A Few years back, we didn’t know the structure of atom; in fact John Dalton considered it to be as hardand dense and as the smallest and indivisible part of matter. But that fact didn’t remain true for long and a new concept in the ...

Those units which are derived from the basic units of SI system are known as Derived units. For example: - the units of area are m2, which are derived from the basic units of length i.e. m. It is most often we find the basic SI ...

With scientific research going all over the world, the communication is very important. This communication becomes very easy if there is an agreement on international level regarding the use of single set of symbols and units for the physical quantities being used. So with the ...

In physical chemistry, there is always a need to measure physical quantities and these measurements involves a numerical ratio between two samples of quantity; one which has to be measured and other one being some standard sample of any kind. Let us suppose we have ...