Question

write 63.9 kilojoules using the unit abbreviation.

Explanation:

Step1: Recall the abbreviation for kilojoules

The unit "kilojoules" has the abbreviation "kJ", where "k" stands for "kilo" (a prefix meaning 1000) and "J" stands for "joule".

Step2: Combine the number and the unit abbreviation

We have the number 63.9 and the unit abbreviation kJ, so we write them together as $63.9\ \text{kJ}$.

Answer:

$63.9\ \text{kJ}$