When a glass rod is kept in steam, its length increases but its width
When a glass rod is exposed to steam, its length increases due to thermal expansion, while its width remains unaffected. Glass primarily expands in the direction of the applied heat, elongating along its length. However, its width does not experience significant alteration, resulting in option A: remaining unaffected.
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The correct answer is; option A. When a glass rod is kept in steam, its length increases due to thermal expansion. However, the width of the glass rod remains unaffected. This phenomenon occurs because glass primarily expands in one direction when subjected to heat, which is along its length. The molecular structure of glass allows for expansion in the direction of the applied heat while maintaining relatively unchanged dimensions perpendicular to that direction. Therefore, although the glass rod elongates when exposed to steam, its width does not experience significant alteration. Option B is incorrect as the width doesn’t decrease. Option C is incorrect as the width doesn’t increase. Option D is irrelevant as the question pertains to physical changes rather than structural disorganization. Thus, the correct choice is option A, where the width of the glass rod remains unaffected by exposure to steam.