Most metals expand as their temperature rises. _____, Invar, an alloy of iron and nickel, changes very little in size over a broad temperature range.
Which choice completes the text with the most logical transition?
For transition questions, determine the relationship between the surrounding sentences before considering the choices. Look for relationships such as contrast, example, similarity, cause and effect, or sequence, and then select the transition whose function matches that relationship precisely.
Hints
Compare the two claims
Consider whether Invar follows the behavior attributed to most metals.
Classify the relationship
Decide whether the second sentence provides an example, shows a similarity, gives a result, or presents an exception.
Test each option
Insert each transition and select the one that most accurately expresses the relationship between the two sentences.
Step-by-step Explanation
Identify the main ideas
The first sentence states that most metals expand when their temperature rises. The second states that Invar changes very little in size across a broad temperature range.
Determine the relationship
Invar does not follow the general pattern described in the first sentence. The second sentence therefore contrasts an exception with the usual behavior of metals.
Evaluate the transitions
“For example” and “Similarly” would suggest that Invar follows the general pattern, while “Consequently” would suggest a cause-and-effect relationship. “However” correctly signals the contrast between the usual behavior of metals and Invar's unusual behavior.
Choose the best transition
The completed text reads logically as follows: “Most metals expand as their temperature rises. However, Invar, an alloy of iron and nickel, changes very little in size over a broad temperature range.”