∵ 1 litre is considered to be 1 kg or 1000 g
∴ half-liter i.e., 1/2 litre should equal to 1/2 kg and 1000/2 g = 500 g
Liquids are also measured in kg, but liquids such as gasoline and diesel are supplied in bulk and it is easier to measure the volume dispensed when it is dispensed, so they are measured in litres.
A liter of water has a mass of almost exactly one kilogram when measured at its maximum density, which occurs at about 4°C. It therefore follows that one thousandth of a liter, called a milliliter (1 ml), of water has a mass of about 1 g; 1000 liters of water have a mass of about 1000 kg (1 ton or megagram).
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