4 kg is the mass of the water. Thus, 4 kg of water has a mass of 4 kg.
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4 kilograms of water has a mass of 4 kilograms. The mass of an object is the amount of matter it contains, and in this case, it's 4 kilograms.
The mass of 1 liter of water is approximately 1 kilogram or 1000 grams.
A gallon of water is bigger than a kilogram in terms of volume. However, a kilogram is heavier than a gallon of water because a kilogram measures weight, while a gallon measures volume.
1.25 liters of water has a mass of 1.25 kilograms.
Originally a kilogram was defined as the mass of 1 litre of water:pure water at a pressure of one bar and a temperature of 4 deg Celsius (when it has its maximum density). However, it was subsequently redefined so that now it is the mass of a standard (or prototype) kilogram which has a mass of 1.000025 litres.
That completely depends on two things -- whatliquid substance you have, and how much of it you have. For example, if it's pure water and you have one liter of it, then its mass is very close to 1 kilogram. If you have only one-half liter of it, then its mass is one-half kilogram, but if you replace the water with mercury, then its mass is 6.8 kilograms. So you see, it depends on the substance, and the amount of it.