В вашем случае in A gaseous state. Если бы было описание состояний жидкости, тогда нужно было бы the. Commercially the term bitumen refers chiefly to hydrocarbons in a solid or semisolid state, but in a wider sense it refers to all natural hydrocarbons, which may also occur in a liquid or gaseous state. ("Bitumen," Microsoft® Encarta® Encyclopedia 99. © 1993-1998 Microsoft Corporation. All rights reserved.) In certain types of analyses, if the material to be analyzed must be in a gaseous state. ("Vacuum Technology," Microsoft® Encarta® Encyclopedia 99. © 1993-1998 Microsoft Corporation. All rights reserved.) The main subdivisions of the study of physical chemistry are chemical thermodynamics; chemical kinetics; the gaseous state; the liquid state; solutions; the solid state; electrochemistry; colloid chemistry; photochemistry; and statistical thermodynamics. ("Chemistry, Physical," Microsoft® Encarta® Encyclopedia 99. © 1993-1998 Microsoft Corporation. All rights reserved.) Vapor, in physics, term for substances in the gaseous state (see Gases; Matter, States of). ("Vapor," Microsoft® Encarta® Encyclopedia 99. © 1993-1998 Microsoft Corporation. All rights reserved.) He developed a theory of corresponding states on the continuity of the liquid and gaseous states of matter expressed in the van der Waals equation. ("Waals, Johannes Diderik van der," Microsoft® Encarta® Encyclopedia 99. © 1993-1998 Microsoft Corporation. All rights reserved.)
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