A liter of water weighs exactly 1 kilogram. However, this weight can vary depending on temperature and pressure.

It is also worth mentioning that a liter is a unit of volume, not weight. So why do we often talk about the weight of a liter of water? This is because the density of water is very close to 1 g/cm³, which is why we usually equate a liter of water with one kilogram.

Another fascinating fact is that water is the only substance that naturally occurs in three states of matter: solid, liquid and gas. This means that water can have different weights depending on its state of aggregation.

In summary, although the weight of a liter of water is usually 1 kilogram, this value can vary depending on temperature and pressure. A liter is a unit of volume, but because of water ‘s density, we often think of it in terms of weight. In addition, water ‘s ability to exist in three different states also affects its weight.