A substance with approximately the same density as water.
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The substance would be liquid water at its maximum density, typically at 4 degrees Celsius. At this temperature, water is most dense and 1 liter of water would weigh approximately 1 kilogram.
The weight of 1 liter of a substance in kilograms depends on the density of the substance. To convert, you would need to know the density of the substance in order to calculate the weight in kilograms.
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.
No, one liter does not always equal one kilogram. The relationship between liters and kilograms depends on the density of the substance. For water, one liter is indeed close to one kilogram, but for other substances with different densities, one liter may not equal one kilogram.
1 liter of water would have a mass of approximately 1 kilogram under standard temperature and pressure.
The density of water is 1 gram per milliliter. Therefore, 1 liter of water would have a mass of 1 kilogram.