if you had 1.5 liters of water, how many milliliters would you have?
There are 1000 millileters per liter. ("Milli" means 1/000). Multiply 1.5 l by that factor.
To find out how many milliliters are in 1.5 liters of water, you need to multiply 1.5 by the conversion factor of 1000 milliliters per liter.
1.5 liters * 1000 milliliters/liter = 1500 milliliters
Therefore, if you had 1.5 liters of water, you would have 1500 milliliters.