Arrange the following materials in descending order, as per the value of their thermal conductivity.
1) Pure iron
2) Liquid water
3) Steam
4) Pure Brass
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A.
4-3-2-1
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B.
4-1-2-3
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C.
2-3-1-4
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D.
1-2-3-4
Correct Answer:
B. 4-1-2-3
Explanation:
Thermal conductivity measures a substance's ability to transfer heat. Among the given materials, pure iron has the highest thermal conductivity at approximately 80 W/mK, followed by pure brass, which typically ranges between 109 and 120 W/mK depending on its specific composition. Liquid water is a poor conductor with a value of about 0.6 W/mK, while steam, being a gas, has the lowest conductivity at approximately 0.023 W/mK. Therefore, the correct descending order is 1-4-2-3.
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