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Why does a gas not have a fixed shape?

Answer and explanation

Correct answer: Particles move freely

The direct answer is option A: particles move freely. A gas has no fixed shape because its particles are far apart, have weak attraction, and move continuously in all directions. When gas is placed in a vessel, the particles spread throughout the available space, so the gas takes the shape of that vessel. Option A correctly states the essential reason: free movement. Option B is wrong because fixed particles describe a solid more nearly, not a gas. Option C is wrong because gas particles do have mass, even though the particles may be very small and widely separated. Option D is wrong because a gas is not a solid; solid and gas are different states of matter. The exact idea is not that the gas has no shape at all, but that it has no own fixed shape and adopts the container's shape. Memory cue: gas particles are free and far apart, so gas fills the container.

Related tags

ChemistryNature-Of-MatterClass-11

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