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Yes. Kilogram is the unit of mass.
yes
of course not
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Kilogram or ton.
Yes, a 2- kg rock has twice the mass of a 1-kg rock, since mass is measured in kilograms.
Gram and kilogram are units of mass, not of weight. Anyway, a kilogram is 1000 grams.
They are both the same weight. Though the mass of the rock would be a lot less than the much greater mass of the puffed rice.
1 kilogram = 1000 grams and 1 gram = 1000 milligrams. You now have all the information required to work out, for yourself, the answer to this and similar questions.
Use grams as the base unit and depending on the size of the rock, grams or deckagrams for a pebble, a small rock hectograms for a rock, and kilograms for a little bigger rock (but still small). The point is to use grams as your base unit.
No.
they weigh the same amount because a pound of mashmallows is the sames as a pound of rocks because 1 pound=1 pound They are both the same.