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Gas is defined as a state of matter characterized by its relatively low density and viscosity compared to solids and liquids. In the gaseous state, particles are widely spaced and move freely, allowing gases to expand to fill their containers. This contrasts with solids, where particles are closely packed and vibrate in place, and liquids, where particles are close together but can flow.

The other options do not relate directly to the defining characteristics of gas. One involves a type of sugar, which pertains more to biological chemistry rather than the states of matter. Another option discusses underground water, which is more about hydrology and the behavior of liquids in soil and rock environments. The last choice refers to a specific fuel mixture, which concerns energy sources rather than the fundamental properties that classify states of matter. Thus, focusing on the distinct properties of gases highlights why the correct answer accurately captures what differentiates gas from other states.