# Examples of Dilation

We explain the examples of dilation. In physics, dilation is the increase in the dimensions (length, thickness) of a body, due to the variation of the temperature in it, especially if it gets warmer. The particles that make up the body, whether they are atoms or molecules, take on greater kinetic energy , that is, they move faster, they agitate. This causes them to cover more volume and their density to decrease slightly.

This phenomenon is more noticeable in metals , which are solid at room temperature (with the exception of mercury) and respond to increases in this. At first glance, it is not appreciated that the metal bar is expanding; however, if a light object is placed near one end, it will be found that it can knock it over. As the metal cools down, its atoms will reconnect to cover the original volume.

Two types of dilation can occur in metals: linear and volumetric . In linear dilation , the particles of the body are arranged in a longer arrangement, comprising a greater distance throughout their extension. In volumetric dilation , the particles in the body are arranged in a larger three-dimensional arrangement, spanning a larger space.

The volumetric expansion occurs mainly in gases, whose atoms or molecules are scattered and, if they are heated more, they will flutter more widely. All substances have the so-called coefficient of expansion ( λ) , which is a constant that helps predict how much it will expand for each degree of temperature that is increased.

### Dilation in biology

In biology, the term dilation is related to the expansion of tissues when developing specific functions. It can be several mechanisms, such as fat storage, aerobic exercise, mechanical work, the transport of blood through the heart muscle, which dilates to suck the next one. In the biological field and in others in general, dilation is the opposite of contraction .

## 20 examples of dilation

1. The coefficient of linear expansion of aluminum is: 23 * 10 -6 (1 / ° C)
2. The coefficient of linear expansion of copper is: 17 * 10 -6 (1 / ° C)
3. The coefficient of linear expansion of zinc is: 25 * 10 -6 (1 / ° C)
4. The coefficient of linear expansion of tungsten is: 4 * 10 -6 (1 / ° C)
5. The coefficient of linear expansion of lead is: 29 * 10 -6 (1 / ° C)
6. The coefficient of linear expansion of steel is: 11 * 10 -6 (1 / ° C)
7. The coefficient of linear expansion of brass is: 1.8 * 10 -5 (1 / ° C)
8. The coefficient of linear expansion of iron is: 12 * 10 -6 (1 / ° C)
9. The coefficient of linear expansion of silver is: 20 * 10 -6 (1 / ° C)
10. The coefficient of linear expansion of nickel is: 12.5 * 10 -6 (1 / ° C)
11. The coefficient of linear expansion of mercury is: 182 * 10 -6 (1 / ° C)
12. The coefficient of linear expansion of bronze is: 19 * 10 -6 (1 / ° C)
13. The coefficient of linear expansion of gold is: 14 * 10 -6 (1 / ° C)
14. The coefficient of linear expansion of platinum is: 9 * 10 -6 (1 / ° C)
15. The coefficient of linear expansion of glass is: 9 * 10 -6 (1 / ° C)
16. An iron rod increases in length when heated.
17. Railroad rails stretch by day and contract at night.
18. The mercury in a thermometer expands to indicate the temperature on the scale.
19. Obesity is the result of excessive dilation of skin tissues when too much fat is stored.
20. The pupil dilates (increases in diameter) to let in more light when it is dark.