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There are five known phases, or states, of matter: solids, liquids, gases, plasma and Bose-Einstein condensates. The main difference in the structures of each state is in the densities of the particles.

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Firm and stable in shape; not liquid or fluid.

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A substance that flows freely but is of constant volume, having a consistency like that of water or oil.

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An air like fluid substance which expands freely to fill any space available, irrespective of its quantity.

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An ionized gas consisting of positive ions and free electrons in proportions resulting in more or less no overall electric charge

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A change from one state (solid or liquid or gas) to another without a change in chemical composition.

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Melting, or fusion, is a physical process that results in the phase transition of a substance from a solid to a liquid.

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Evaporation is a type of vaporization of a liquid that occurs from the surface of a liquid into a gaseous phase that is not saturated with the evaporating substance.

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The action of bringing a liquid to the temperature at which it bubbles and turns to vapor.

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Water that collects as droplets on a cold surface when humid air is in contact with it.

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Sublimation is the phase transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase.

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A part or aspect of something abstract, especially one that is essential or characteristic.

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The pure substance within chemistry is a very simple concept to grasp. Pure substances are defined as substances that are made of only one type of atom or only one type of molecule (a group of atoms bonded together).

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A solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity (e.g., iron, gold, silver, copper, and aluminum, and alloys such as brass and steel).

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An element or substance that is not a metal.

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an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. They are electrical semiconductors.

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A thing that is composed of two or more separate elements; a mixture.

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A substance made by mixing other substances together.

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A means of solving a problem or dealing with a difficult situation.

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A solvent is a substance that dissolves a solute, resulting in a solution. A solvent is usually a liquid but can also be a solid or a gas.

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The action or power of focusing one's attention or mental effort.

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Solubility is a chemical property referring to the ability for a given substance, the solute, to dissolve in a solvent.