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Encyclopedia > Gases

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	frame (302 words) First, the behavior of gases is easier to describe because most of the properties of gases do not depend on the identity of the gas. Compounds that are gases at room temperature are all covalent compounds (such as CO and NH) that contain two or more nonmetals. As a general rule, compounds that consist of relatively light, covalent molecules are most likely to be gases at room temperature. Volcanic Hazards: Gases (sulfur dioxide, carbon dioxide, hyrdogen chloride, and hydrogen fluoride) (1958 words) Gases are also released from magma that either remains below ground (for example, as an intrusion) or is rising toward the surface. The gases spread from an erupting vent primarily as acid aerosols (tiny acid droplets), compounds attached to tephra particles, and microscopic salt particles. The volcanic gases that pose the greatest potential hazard to people, animals, agriculture, and property are sulfur dioxide, carbon dioxide, and hydrogen fluoride.
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