• Scientific notation is used by the astronomers for their calculation of distance, speed, revolution of the planets around the sun.
• The meteorologic department who have to calculate the changing weather.
• Electrical engineers for their trigger operations which has ten thousand operations per second.
• The players of Chess games to see the number of all possible games.
• Physicists use it to measure the distance between particles.
• Geologists use it to measure the age of rocks.
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The uses of scientific notation in chemistry are to compute very large or very small numbers.
They don't usually.
It is not. "Scientific notation" uses a base of 10. The correct notation would be 1.251 x 10^8
Scientific notation is a short hand way of expressing numbers that are very large or very small such as 10,000,000 = 1.0*107 or 0.0000001 = 1.0*10-7
Scientific notation gives a compact notation, which is especially useful for writing down - and doing calculations with - very large, and very small, numbers.