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# How Solids Are Classified

Solids are one of the four fundamental states of matter. As the name suggests, solids are composed of molecules that are closely packed together, with the least amount of kinetic energy. These substances are also structurally rigid, and a force applied to their surface will produce no visible motion. Let’s take a look at some examples. How can solids be classified? Read on to discover more! The four main types of solids are gas, liquid, and vapor.

## Physical properties

What is the difference between a liquid and a solid? A solid has a definite shape, while a liquid can flow, liquefy, or be melted. Both forms of a solid are made up of particles with different physical properties. Solids are more dense than liquids and do not flow like liquids. They are also non-conductor of electricity. A liquid can be molded into a shape by applying a force, while a solid cannot.

## Compound words

If you want to know which words are in the same word class, you must first recognize the different kinds of compound words. Open compound words are those with multiple constituents separated by blank spaces, and solid compound words are those with only one constituent. When you recognize a solid compound word, you can quickly identify the other words in the same word class by examining the prefix and suffix of the unknown word. In the following paragraphs, you will learn how to recognize solid compound words.

## Structure

Solids have definite shapes and a fixed volume and can be divided into two basic types: crystalline and amorphous. The difference between the two types of solids depends on the nature of their constituent molecules. Crystalline solids are formed by repeating patterns of atoms that have the same structure and properties as one another. These patterns are referred to as atomic structures. The following article focuses on the atomic structure of solids.

## Volume

A solid’s volume is the total space it occupies. Solids are measured in cubic decimeters (dm3), while liquids are measured in cubic meters (L). For solids, the volume of a cube is equal to its height times its diameter. A cylinder’s volume is 7.82 cm3 or 7.82 mL. Solids can be classified according to their density. To find their density, measure their length, width, and height.

## Electrical conductivity

The energy-band characteristics of a substance are intimately related to its electrical conductivity. Hence, the conduction mechanism for solids is important for understanding the nature of electricity. The energy-band properties of various types of solids are discussed in this article. Read on to learn more about the electrical conductivity of solids and how it varies with temperature. Listed below are some common solids. Their electrical conductivity can be used to measure the efficiency of a circuit or determine the electrical resistance of a device.

## Temperature required to change a solid from a liquid to a solid

The process of changing a solid into a liquid is known as melting. When a solid is heated, its particles begin to vibrate much faster, eventually breaking up the ordered structure, allowing it to turn into a liquid. This process occurs at a certain temperature, also known as its melting point, which is different for each solid. For example, ice melts at 0deg C, while mercury melts at -39oC.