2.5 kL.
1,000 L per 1 kL
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There is no equivalence.
A kilogram is a measure of mass. A litre is a measure of volume. The two measure different things and,according to basic principles of dimensional analysis, conversion from one to the other is not valid.
If you are not convinced, consider a litre of air. How many kilograms? Next consider a litre of lead. How many kilograms? The masses of equal volumes of the two substances will clearly be very different. So there is no direct conversion between mass and volume: you need to know the density of the substance to enable you to carry out the conversion.
Some people still believe that there is a conversion in relation to pure water but that is only approximately true. Until 1964 (nearly 50 year ago!) a litre was defined as the volume of one kilogram of pure water at 4 degrees Celsius and at a pressure of 760 millimetres of Mercury. With that definition a conversion would have been valid - but only for pure water and only under those conditions. In any case that definition of a litre was abandoned in favour of 1 litre =1000 cubic centimetres.
In fact the density of pure water, at 4 deg C and 760 ml of mercury is 999.9720 kg/metre3
2700L equals 2.7kL (1,000 liters per kL)