In general, the density of water is 1000 kg/m3, and a liter of water is1.0 kg/l *1l =1.0 kg (that is, 2 kg).

Water 1 l = 1 kg = 1000 g a liter of water is generally 1 kg? Because M= density * volume

So m water =1000 * 0.001=1kg?

For direct use, for example, a liter of water is 1 kg, and 1 ml of water is 1 g. 。

Extended data Generally speaking, no matter what substance or state it is in, with the change of temperature and pressure, the volume or density will change accordingly. The relationship between temperature T, pressure P and density ρ (or volume) is called the equation of state.

The density of a solid or liquid substance changes only slightly when the temperature and pressure change. For example, in the vicinity of 0℃, the temperature coefficients of various metals (the rate of change of object volume when the temperature rises 1℃) are mostly around 10-9. The pressure in deep water and underwater explosion can reach hundreds of atmospheres, or even higher (1 atmospheric pressure =101325pa), so the change of density with pressure must be considered.

References:

Baidu encyclopedia entry-density