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www.livescience.com/53304-gases.html

Gas is a state of matter that has no fixed shape and no fixed volume. Gases have lower density than other states of matter, such as solids and liquids. There is a great deal of empty space between ...

en.wikipedia.org/wiki/Gas

If the pressure-dependence is neglected (and possibly the temperature-dependence as well) in a particular application, sometimes the gas is said to be a perfect gas, although the exact assumptions may vary depending on the author and/or field of science. For an ideal gas, the ideal gas law applies without restrictions on the specific heat.

www.thoughtco.com/definition-of-gas-604478

A gas is defined as a state of matter consisting of particles that have neither a defined volume nor defined shape. It is one of the four fundamental states of matter, along with solids, liquids, and plasma. Under ordinary conditions, the gas state is between the liquid and plasma states.

whatis.techtarget.com/definition/gas

A gas is a sample of matter that conforms to the shape of a container in which it is held and acquires a uniform density inside the container, even in the presence of gravity and regardless of the amount of substance in the container. If not confined to a container, gaseous matter, also known as vapor, will disperse into space.The term gas is also used in reference to the state, or condition ...

www.britannica.com/science/gas-state-of-matter

Gas: Gas, one of the three fundamental states of matter, with distinctly different properties from the liquid and solid states. The remarkable feature of gases is that they appear to have no structure at all. They have neither a definite size nor shape, whereas ordinary solids have both a definite size

www.yourdictionary.com/gas

gas definition: Gas is defined as an air-like substance that expands to fill the space it is in. It also refers to a substance used as fuel. (noun) An example of gas is helium. An example of gas is the fuel you put in your car to get it to move.... Definitions. gas gas.

www.dictionary.com/browse/gas

gas in Science. gas [găs] One of four main states of matter, composed of molecules in constant random motion. Unlike a solid, a gas has no fixed shape and will take on the shape of the space available. Unlike a liquid, the intermolecular forces are very small; it has no fixed volume and will expand to fill the space available.

www.kiwico.com/.../02/02/kid-friendly-science-experiments-gas

Get hands-on with gas as a state of matter in these ten fun science experiments for kids. You’ll discover the awesome fizzy reactions and the incredible power gasses like air have! Try these at home with the family and see for yourself. Side note: a joke or two will come with the territory of ...

www.chem4kids.com/files/matter_gas.html

Those are both examples of gas forced into a smaller space at greater pressure. As soon as the gas is introduced to an environment with a lower pressure, it rushes out of the container. The gas molecules move from an area of high pressure to one of low pressure.

www.youtube.com/watch?v=wclY8F-UoTE

Matter is made of atoms, and the arrangement of the atoms determines whether the substance is solid, liquid, or gas. Learn more about the three main states of matter in this kid-friendly video!