| 摘要 |
A gas migration inhibitor which lyes on a surface of a material to inhibit the migration of gas from the material. This migration inhibitor has a specific gravity of less than a liquid in which it is placed, floating on a surface of such material within a container in which the liquid material is held, and is non porous so as to inhibit the escape of gas from the material, or the evaporation of the material.
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