**Why does ice float on water?**

Physics surrounds us whether we are aware of it or not. Today, the subject of this article will be density. The definition of density is not difficult to understand: it is simply the mass of a substance per unit volume. In other words, it is the ratio or proportion of mass to volume.

The best way to understand the concept of density is to use the example of water and ice. Because ice floats on water, hence it has a lower density. Wood, for example, can also be lighter than water. And one of the densest materials (and the most valuable) is gold.

How do you calculate density? What is the formula for density?

**The formula for density can be calculated by knowing the mass and volume of a material** – simply divide one by the other. This principle works not only in physics, but also in chemistry. The density formula is quite universal in the scientific world.

There are two basic units of density – kilogram per cubic metre and gram per cubic centimetre.

The formula for density is one of the simplest formulas. When trying to understand what density is, it is useful to remember a few basic things – firstly, in physics, density is not a fluidity or viscosity, but defines the heaviness of a material. If we know the density, we can calculate the mass of a body provided that we know its volume or its volume when we know its mass. Density can change with the same mass and volume – it depends on temperature and pressure. In principle, it doesn't matter much for solids or even liquids, but you will easily notice the changes when it comes to gases. The easiest way to measure density is in the laboratory – simply weigh the material of interest and then immerse it in water and calculate the increase in volume in the container.

Now you must know why ice and wood can float on water. Of course, the correct answer is that their density is lower than that of water (they are lighter and, therefore, float freely on water). This follows on from the formula for density.

Remember that what we say in common is not always reflected in the scientific world. It is worth remembering what density is in the scientific world.

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