A jar contains one half of a kilogram of water. How many grams of water does it have?
1 kg = 1000 grams
0.5 * 1 kg = 500 grams
To convert kilograms to grams, you need to multiply the value by 1000 since there are 1000 grams in one kilogram.
In this case, since the jar contains one half of a kilogram of water, you can calculate the number of grams by multiplying 0.5 (half kilogram) by 1000:
0.5 kg * 1000 g/kg = 500 grams
Therefore, the jar contains 500 grams of water.