The Sl units are a standard most all over the world.
For us that now are used to Milligrams, Grams, Kilograms this is very easy. It takes hardly any mathskill at all to calculate between them as it works the same way as with numbers.
If I were to weigh a Cherry, then I would use Gram, but if I were to sell a basket of Cherries, then I would use Kilo. I would think that one basket of Cherries is about 1/4 Kilo.
This however does not make a lot of sense to customers in an area where they only are used to pounds and oz.
If you are to sell your Cherries, then you would need to put forward the weight in a unit your customers can easily relate to as in what they are used to.
it is in the us customary unit or else we wouldnt be learning about. there for it is in the us customary unit.
Grams (g)
The best unit of measurement to determine the mass of a book is grams.
It would be yards.
feet
The customary unit to weigh an apple is typically in ounces or grams.
Somone answer this for god sakes
inch
The ounce.
Length in inches.
Fahrenheit is a customary unit
customary
Wild budgerigars weigh 1.1-1.4 oz.
it is in the us customary unit or else we wouldnt be learning about. there for it is in the us customary unit.
In most countries, it is customary to measure that in liters.
the metric system
It is customary to use the kilogram - though that is technically not a weight, but a mass.