To convert 1/5 of a quantity to milliliters (ml), you need to know what quantity you are converting. For example, if you are converting 1/5 of a liter to milliliters:
1 liter = 1000 ml
So, 1/5 of a liter is:
1/5 * 1000 ml = 200 ml
If you have a different quantity or are referring to a specific volume, please provide that information for a more precise answer!