Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning - Discussion


The highest thermal diffusivity is of

[A]. iron
[B]. lead
[C]. concrete
[D]. wood

Answer: Option B


No answer description available for this question.

Jagan said: (Nov 11, 2013)  
Option is iron because k value is high out of given options.

Thermal diffusivity = k/heat capacity.

Goutham said: (Nov 16, 2013)  
What is the k value of lead?

Badri said: (Feb 15, 2014)  
That is not the K value, it is Thermal Diffusivity 'ALPHA' value for lead is 23.46*10^-6.

Vivek said: (Apr 10, 2014)  
Thermal diff = thermal conductivity/density * heat capacity at constant pressure.

But what is the value of k for iron and lead.

Kannan P said: (May 28, 2015)  
Iron K = 80w/mk.
Lead K = 35w/mk.

Iron is correct answer.

Govind Agrawal said: (Aug 19, 2015)  
For iron:

Thermal difference = k/(den*heat cap) = 46.33/(.26*.12) = 1484.93.

For lead:

Thermal diff = k/(den*heat cap) = 20.39/(.41*.032) = 1554.12.

HENCE LEAD is correct answer.

Rishabh said: (Sep 1, 2016)  
Yes, lead is correct answer.

I agree with you @Govind Agrawal.

Prasantabal said: (Jun 27, 2019)  
You are Absolutely right, thanks @Govind.

Sajid Mohammed said: (Feb 19, 2020)  
Wood is correct.

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