21 kilograms is equal to 21000 grams.
1 kilogram is 1000 grams.
2.1 grams is 0.0021 kilograms
1000 grams = 1 kilogram so 21 g = 21/1000 = 0.021 kg. Simple!
The tonne is a "metric ton" or "megagram". The only prefixes normally used with this unit are :kilotonne - (1000 tonnes, or 1 million kilograms)(1 x 106 kg or 1 x 109 grams)megatonne - (1 million tonnes, or 1 billion kilograms) (1 x 109 kg or 1 x 1012 grams)A zettatonne would equal to 1021 tonnes which is 1024 kilograms or 1027 grams.
It is the latter
That is approximately 4.2 teaspoons
9.52 kg
.21 pounds per US gallon is about 25.163 grams per liter.
There are 21 teaspoons of salt in 100 grams.
A zettagram is a unit of mass equal to 10^21 grams (or 1,000,000,000,000,000,000,000 grams).
21 ounces = 595.34 grams.
By definition a kilogram is 1,000 grams. (A "kilo" is the prefix that means one thousand. That's one reason you sometimes see a number like 55,000 referred to as 55K). 21 kg x (1,000 g / 1 kg) = 21,000 grams
21 pounds = 9.525 kilograms.
A zeptogram is a unit of mass equal to 10-21 grams.