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# What Is a Solid?

A solid is one of the four fundamental states of matter. It is able to resist forces applied to it perpendicularly or parallelly to its surface, retains its shape, and is much denser than a liquid or a gas. Learn more about solids in this article. In addition, find out the difference between liquids and gases. A solid’s density makes it easier to compress or expand, which is beneficial for engineers.

## Solids are one of the four fundamental states of matter

A solid is a substance that has a definite volume and shape. It is also incompressible and has a high melting point. Solids can be classified into two basic types: crystalline and amorphous. Crystalline solids are composed of crystalline elements, whereas amorphous solids lack crystals. Each type has distinct properties. Here are a few facts about each.

A solid has a regular shape and volume, and requires an external force to change its shape. Most solids are crystalline, such as rock and salt. The transition between solids and liquids can occur by releasing heat energy. Liquids are made of loosely packed constituent particles with more kinetic energy than solids. Therefore, liquids have a definite volume but a loose shape.

## They resist forces applied perpendicular or parallel to a surface

A solid is one of the three basic states of matter. Its properties are unique to solids and are determined by the atoms that make up the substance. The forces between atoms also play a role in determining the solid’s characteristics. Its ability to resist forces is called its strength, and it also determines the material’s resistance to shear and perpendicular loads.

## They keep their shape

There are many things we can’t change about solids, such as the fact that they can’t flow or expand like liquids. But the fact remains: solids keep their shape without a container to hold them. If you take a look at what happens when you remove a solid from a container, you will notice that it will retain its shape, even if it gets very cold or extremely hot. This is because solids are made of atoms that are placed in a regular lattice. As a result, solids cannot be compressed or expanded, only mixed with other solids.

All matter has mass and occupies space. Matter exists in three different phases. There is solid, liquid, and gas. Solids keep their shape and size, while liquids change form and flow. While two liquids can mix, a solid will always retain its shape. But liquids can be poured and can be molded, but they will lose their shape as they cool. In contrast, gases can be poured, but they will change shape depending on the container they are in.

## They are more dense than liquids and gases

Because solids are packed tightly together, their density is higher than that of liquids. In contrast, liquids have a lower density because their molecules are spread out and do not have a high concentration of mass. Gases, on the other hand, have very low densities because their molecules have a large amount of inter-molecular space. These differences are important in understanding the properties of different materials, including liquids and solids.

What makes solids more dense than gases and liquids? In simple terms, solids have higher density because their atoms do not move around freely, like in liquids and gases. Solids can be crystalline like table salt, or amorphous like glass. Most elements are solids at room temperature. The density of solids is proportional to the amount of molecules, so the heavier a substance is, the more dense it is.