What is 4 l in a h?

4 liters (l) is equivalent to 0.004 cubic meters (m³) or 4,000 milliliters (ml). In terms of hours (h), if you are referring to a flow rate, you would need to specify the rate to determine how long it takes to fill or use that amount of liquid. Without additional context, 4 liters simply remains 4 liters regardless of time.