To convert milliliters to liters, we need to remember that 1 liter (l) is equal to 1000 milliliters (ml). Given that 1 cup of water contains 250 ml, we can find out how many liters are in 1 cup by using the conversion:
1 cup = 250 ml
Now, to convert 250 ml to liters, we can use the formula:
Liters = Milliliters ÷ 1000
Plugging in the values:
Liters = 250 ml ÷ 1000 = 0.25 l
Therefore, there are 0.25 liters in 1 cup of water.