Convert 21 Joules to Kilojoules
How much energy is 21 joules? How many kilojoules are in 21 joules? 21 J to kJ conversion.
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21 Joules =
0.021 Kilojoules
exact result
Decimal places
Result in Plain English
21 joules is equal to exactly 0.021 kilojoules.
To a Percentage
21 joules = 2.1% of a kilojoule.
Result as a Fraction
21 joules
= 21⁄1,000 kilojoules
In Scientific Notation
21 joules
= 2.1 x 101 joules
= 2.1 x 10-2 kilojoules