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No. Scientific numbers are constants that appear in science. They may or may not require scientific notation.
Scientific notation is often used to represent very large and very small numbers. Actually, you can also express a "normal-sized" number in scientific notation. So, whenever there is a number, you may use scientific notation.
Nothing is measured in scientific notation. Scientific notation is used merely to represent the result of some measurement - especially when that outcome is a very small or a very large number.
It is "gram", which may be abbreviated to "g".
In today's notation of Roman numerals it is: V-MCMLXXIV