Difficulty: Easy
Correct Answer: Condense
Explanation:
Given data
Concept/Approach
'Expand' = to increase in size/volume/extent. 'Condense' = to make denser or more compact; to reduce volume. This is the clean antonym pair widely used in science and writing.
Why not the others
Convert: change form/function; not opposite of size change.Congest: to overcrowd; does not cleanly reverse an item’s expansion.Conclude: to end/finish; unrelated to volume/extent.
Memory hook
Gas expands when heated, steam condenses when cooled.
Final Answer
Condense
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