None.
A millimetre is a measure of length in 1-dimensional space while a litre is a measure of volume in 3-dimensional space. The two measure different characteristics and, according to the most basic principles of dimensional analysis, any attempts at comparisons or conversions between the two are fundamentally flawed.
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125 mm
1 inch = 25.4 millimeters.
1000 millimeters is 1 meter
7.5 kilometers = 7 500 000 millimeters
1 litre = 1000 cm3 so 2 litres = 2000 cm3. Simple!