Final answer:
Gases do not have a definite shape or volume, and they exhibit unique characteristics such as filling their container, compressibility, and low density when compared to solids or liquids.
Explanation:
Gas molecules are assumed to have no volume is not true according to the kinetic molecular theory. Gases do not have a definite shape or volume; they fill the container they are in, can compress and expand, and have low densities compared to solids or liquids. Combinations of gases mix together spontaneously, explaining their properties.
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