Neither, 1500 mL and 1.5 L are equal to the same volume.
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There are 1.5 liters in 1500 mL.
There are 1500 mL in 1 and a half liters.
1500 ml equals 1.5 liters.
1 mL = 0,001 L; the ratio L/mL is 1 000.
1 liter = 1000 mL 1500mL x (1L/1000L) = 1.5 L