In the same way as the scientific notation is used elsewhere.
1 light year, for example, is 9.4607*1015 metres.
1 Planck's distance equals 1.6162*10-35 metres.
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Scientific notation is used when vast quantities of numbers are used such as the distances of faraway planets or in biology when the tiniest of decimals are used.
Scientific notation is usually used to represent large numbers. For example - the number 123,400,000,000,000,000 can be represented in scientific notation as 1.234 x 1017. It's commonly used in astronomy when referring to the vast distances between stars etc.
Scientific notation is scientific notation - whether it is used for metric units, Imperial units or simply for numbers.
Scientific notation is used in numbers that are very large, or small- also if they include many zeroes. For example, they are used to show atomic values of distances/sizes of celestial beings. (the sun, stars, etc) Or, an electron's weight.
Five billion in scientific notation is written as 5 x 10^9. In scientific notation, the number is expressed as a coefficient (5) multiplied by 10 raised to the power of the exponent (9), representing the number of zeroes in the original number (five billion). This notation is commonly used in scientific and mathematical calculations to simplify large numbers.