Homonym: gas (Fuel)
Gas is one of the three main states of matter, alongside solids and liquids. It consists of tiny particles that are far apart and move freely, which allows gases to fill any space they occupy. Common examples of gases include oxygen, which we breathe, and carbon dioxide, which plants use for photosynthesis.
Gases are often invisible and can be found all around us. They can be compressed, meaning they can be squeezed into a smaller volume, and they can also expand to fill larger spaces. Everyday items like balloons and car tires rely on the properties of gas to function properly.