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In descending order of magnitude, the thermal conductivity of
a. Pure iron,                                                                            
b. Liquid water,
c. Saturated water vapour, and
d. Pure aluminium can be arranged as
  • a)
    a b c d
  • b)
    b c a d
  • c)
    d a b c
  • d)
    d c b a
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
In descending order of magnitude, the thermal conductivity ofa. Pure i...
Thermal Conductivity of Different Substances

Thermal conductivity is the property of a material that determines how quickly it can transfer heat through it. It is usually measured in watts per meter per kelvin (W/m.K). In this question, we are given four substances, and we need to arrange them in descending order of thermal conductivity.

a. Pure Iron

Pure iron is a good conductor of heat, and its thermal conductivity is around 80 W/m.K. This means that it can transfer heat quite quickly through it.

b. Liquid Water

Liquid water has a thermal conductivity of around 0.6 W/m.K. This is much lower than that of pure iron, which means that water is not a good conductor of heat.

c. Saturated Water Vapour

Saturated water vapor has a thermal conductivity of around 0.03 W/m.K. This is much lower than that of liquid water, which means that water vapor is an even worse conductor of heat.

d. Pure Aluminium

Pure aluminium is an excellent conductor of heat, and its thermal conductivity is around 237 W/m.K. This is much higher than that of pure iron, which means that aluminium can transfer heat even more quickly than iron.

Arrangement of Thermal Conductivity in Descending Order

Based on the above information, we can arrange the substances in descending order of thermal conductivity as follows:

1. Pure Aluminium - 237 W/m.K
2. Pure Iron - 80 W/m.K
3. Liquid Water - 0.6 W/m.K
4. Saturated Water Vapour - 0.03 W/m.K

Therefore, option C, i.e., a-b-c-d, is the correct answer.
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In descending order of magnitude, the thermal conductivity ofa. Pure iron, b. Liquid water,c. Saturated water vapour, andd. Pure aluminium can be arranged asa)a b c db)b c a dc)d a b cd)d c b aCorrect answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about In descending order of magnitude, the thermal conductivity ofa. Pure iron, b. Liquid water,c. Saturated water vapour, andd. Pure aluminium can be arranged asa)a b c db)b c a dc)d a b cd)d c b aCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In descending order of magnitude, the thermal conductivity ofa. Pure iron, b. Liquid water,c. Saturated water vapour, andd. Pure aluminium can be arranged asa)a b c db)b c a dc)d a b cd)d c b aCorrect answer is option 'C'. Can you explain this answer?.
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