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Then why does 1 liter the water in ~ max density (4 °C) have actually a massive of 1 kg? Is it a only coincidence?
It is not a coincidence. As the Wikipedia write-up on the Litre says:
One litre of water has a mass of almost exactly one kilogram once measured at its maximal density, which occurs at about 4 °C. Similarly: one millilitre (1 mL) the water has actually a massive of around 1 g; 1,000 litres of water has a fixed of around 1,000 kg (1 tonne). This partnership holds due to the fact that the gram to be originally characterized as the mass of 1 mL of water; however, this definition was abandoned in 1799 since the thickness of water alters with temperature and, very slightly, through pressure.
1 liter of water equals $1 mathrmkg$ weight.1 liter that water is also the same as $1000 mathrmcm^3$ i.e. Cubic centimeter ($10 mathrmcm imes10 mathrmcm imes10 mathrmcm$ in volume) and1 liter is the very same as 1 cubic decimeter (10 centimeters is 1 decimeter).
Therefore 1 cubic meter volume is the very same as 1000 cubic decimeter or 1000 liters and that is why 1000 liters that water weighs $1000 mathrmkg$ or 1 ton.Similarly, $1 mathrmcm^3$ is the very same as $1 mathrmml$ and also weighs $1 mathrm g$ that water.
It is not a only coincidence but a basic equivalence measurement in between the Metric system and also the SI system of measurements.
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