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Gas typically refers to a substance in its gaseous state at room temperature and atmospheric pressure.

Gases are one of the three main physical states of matter, alongside liquids and solids. Gases have no fixed shape or volume, and will expand to fill any container they are placed in. Gases can be either flammable or non-flammable, and may present a range of hazards depending on their chemical properties and the conditions under which they are stored, handled, or used.

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