* Kilometers (km) measure distance. They tell you how far apart things are.
* Liters (L) measure volume. They tell you how much space a substance occupies.
You can't directly compare distance and volume. It's like asking "What fraction of an hour is a kilogram?".
To make a comparison, you need to relate liters to something that measures distance. Here's a way to think about it:
* Imagine a cube that's 1 meter wide, 1 meter long, and 1 meter high. This cube has a volume of 1 cubic meter (m³).
* 1 cubic meter is equal to 1000 liters.
So, a liter is 1/1000th of a cubic meter, which can be written as a fraction: 1/1000.
