gram is multiple and milligram is sub multiple of kilogram
They are related as they are parts of the same measurement unit: They are either whole kilograms or fractions of a kilogram, or both, as in 12kg 23gm.
Multiple and sub-multiples are used when the range of values is too large to be measured in a single unit.
· The multiples and sub multiples of mass are the Petagram, teragram, gigagram, megagram, kilogram, gram, milligram, microgram.AnswerAs the SI base unit for mass is the kilogram, the gram is the submultiple -not the other way around!
Mass can be measured in -- kilogram, and any of its multiples and sub-multiples -- pound-mass -- slug
"one millionth of ..."
There are uncountably many of them, because the prefixes can go on for ever.
That probably refers to the SI prefixes, such as kilo (meaning 1000), mega (meaning a million), milli (meaning 1/1000), etc.
There are smaller masses but they need not be submultiples.
It isn't technically necessary; it is used for convenience, to avoid using very small or very large numbers.
mm,cm,m,kmA2, The Standard unit of length is the Metre. This can have applied the common multiples and sub-multiples, such as Mega and milli etc.
One common unit used in the solar system is the astronomical unit (AU), which is the average distance from Earth to the Sun. Another unit is the light-year, the distance light travels in one year. Both of these units are helpful for measuring vast distances within our solar system.
these are used to express very large number small and very small