Because a pencil has a mass of a few grams.
Metric ruler
Im pretty sure kilograms is appropriate
you use kilograms
An appropriate volume of any liquid will have a mass of 27.6 grams.
gramsA basketball weighs about 600 grams. You could say 0.6 kg but it is easier to understand if you don't need decimals.
you would use gallons
centimeters
centimeters or grams
Kilograms, probably.
gram
Nothing can 'weigh' two grams, because the gram is not a unit of weight (it is the metric unit of mass). However, two grams would likely weigh something close to the weight of a pencil.
The metric unit for mass is the kilogram. For smaller masses, as in this case, you may also use grams or milligrams.
Metric ruler
grams
yes
the metric units for mass are grams, kilograms, milligrams, ect.
In my opinion, the best unit for measuring the weight of a pencil would be grams. :)* * * * *Grams may be used for measuring mass, but that is not the same as weight. The best unit is probably a milliNewton.