Which statement about gases is correct, regarding their expansion when heated?

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1. Which statement about gases is correct, regarding their expansion when heated?

Gases undergo only areal (surface) expansion

Gases have no definite shape, and undergo only volume expansion, not separate linear or areal expansion

Gases expand identically to solids when heated

Gases contract, rather than expand, when heated

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Because a gas has no fixed shape, it fills its container completely. It doesn’t have a separate linear or areal expansion — only an overall volume expansion applies.