Depending on what you do for a living would determine how you would use it. I mainly use scientific notation as a shorthand when keying large numbers into a spreadsheet. Instead of typing a 2 with 6 zeros for 2 million, I can just type 2e6 and hit enter. Less chance for error, having to count the zeros.
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Scientific notation is useful for very large or very small numbers. If you use such numbers in your "real world", then scientific notation will be very useful. This may be the case, for example, when you work in science or engineering. Otherwise, if you don't work in an area that uses such large or small numbers, you probably won't find much use for them.
psychologist do not usually use scientific notation
Yes, physicists use scientific notation
Mostly the sciences use scientific notation
When working with really large or really small numbers.