When working with really large or really small numbers.
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Scientists? It's handy for writing out any large numbers...
psychologist do not usually use scientific notation
Yes, physicists use scientific notation
Mostly the sciences use scientific notation
Scientific notation is a way to write very large or very small numbers using exponents. For example 2000 is 2x103 . We can do the same thing with negative exponents and write very small numbers like 1/2000 which is 2x10-3 . So one real life use of exponents in in scientific notation.