Density is one of characteristics of substance, the same as weight, volume, temperature, area. It is equal to the weight relation to volume. The main objective is to learn to calculate this size and the nobility what it depends on.
Instruction
1. Density of substance is a numerical relation of weight to substance volume. If you want to determine substance density, and its weight and volume are known to you, finding of density will not be to you work. The easiest way to find density in this case is p = m/V. It is measured in кг/м^3 in the SI system. However these two values therefore it is necessary to know several ways by means of which it is possible to calculate density are not always given.
2. Density has different values depending on a type of substance. Besides, density of substances changes also from degree of salinity and temperature. At reduction of temperature density increases, and at decrease in degree of salinity also density goes down. For example, density of the Red Sea is still considered high, and in the Baltic Sea it already less. All of you noticed that if to add oils to water, it emerges upward. All this occurs because oil water has lower density, than. Metals and stone substances, on the contrary sink as their density is higher. On the basis of density of bodies there was a theory about their swimming.
3. Thanks to the theory of flotation there was a formula on which it is possible to find body density, knowing the water density, volume of all body and volume of its shipped part. This formula has an appearance: Vpogruzh. parts / the V bodies = p body / p zhidk. From this it follows that density of a body can be found as follows: r bodies = V pogruzh. parts * r zhidk / the V bodies. This condition is satisfied proceeding from tabular data and the set volumes of V pogruzh. parts and the V bodies.