Scientific notation is used to communicate the level of precision used to keep track of very small and very large numbers during mathematical calculations used to accurately measure volumes used to measure length with precision

used to keep track of very small and very large numbers during mathematical calculations

Explanation:

Scientific notation makes data easy to understand and manageable. It is used to express decimal numbers that are cumbersome to write. They simplify mathematical operations.  

For example a number such as 1877655600 can be conveniently expressed in scientific notation as 1.87 x 109. Similarly a number such as 0.000000789 can be conveniently expressed in scientific notation as 7.89 x 10-7.  

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.