I'm unit of volume,

Kilogram is a unit of mass, and the two cannot be confused. Junior high school students often make such mistakes.

Different physical quantities cannot be equal, but there is a conversion relationship between them. That's the formula of density, m = ρ v.

But it can be said that the mass of 1 liter of water is 1 kg. Or the mass of 1 kg water is 1 liter.

However, not all 1 liter of liquid is 1 kg. From the above formula, we can know that volume is related to density. For example, 1 liter of alcohol is only 0.8 kg, while 1 liter of mercury is 13.6 kg.

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