Scientific notation is a very convenient way to write large and small numbers and avoids having to write down so many zeros. It makes multiplying and dividing a lot easier.
For example, say you want to multiply 1000000 by 0.00001
That is 1 x 10^6 x 1 X 10^-5 and you addd the exponents of the 10 to get 10^1 = 1
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Mostly the sciences use scientific notation
psychologist do not usually use scientific notation
Yes, physicists use scientific notation
People in the sciences are the main professions that use scientific notation
Professions that do not use scientific notation are most anything outside the sciences.