To convert milliliters to liters, you need to divide by 1000 since there are 1000 milliliters in a liter. Therefore, 70ml is equal to 70/1000 = 0.07 liters. To express this as a fraction, you would write it as 70/1000, which can be simplified to 7/100. So, 70ml is equivalent to 7/100 of a liter.