Answer:1500 Step-by-step explanation:To convert 1.5 liters to milliliters, we need to know that there are 1000 milliliters in 1 liter.So, to convert 1.5 liters to milliliters, we multiply 1.5 by 1000:1.5 liters * 1000 milliliters/liter = 1500 millilitersTherefore, 1.5 liters is equal to 1500 milliliters.