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Difficulty: MediumEliminating Wordiness

Aerogel, a synthetic ultralight material derived from a gel, consists of more than 99 percent air. Despite its light weight, it is remarkably strong and can support thousands of times its own mass. Because of its properties as an insulator, which insulate against heat, it is used by aerospace engineers for insulation in spacecraft.

Which choice most effectively and concisely expresses the information in the underlined portion?

  1. A
    NO CHANGE
  2. B
    Because it insulates against heat, which is used by aerospace engineers in spacecraft.
  3. Because it insulates against heat, aerospace engineers use it in spacecraft.Answer
  4. D
    With heat insulation being provided by it, aerospace engineers use it in spacecraft.

Answer

Because it insulates against heat, aerospace engineers use it in spacecraft.
The correct answer is the most concise and direct option. It eliminates the repetitive use of 'insulator,' 'insulate,' and 'insulation' found in the original sentence, and uses an active voice structure that is grammatically complete.

Step-by-Step Solution

1
Identify the redundant and wordy elements in the original sentence.
The words 'properties as an insulator,' 'insulate against heat,' and 'insulation' repeat the same concept redundantly.
ACT English requires eliminating unnecessary repetition to improve clarity and flow.
2
Evaluate the choices to find the one that removes redundancy while maintaining a complete sentence.
The correct choice must express the relationship clearly using active voice and without fragmenting the sentence.
Conciseness should not come at the expense of grammatical correctness.

Key Concept

Eliminating Wordiness
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Topics

Eliminating Wordiness

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