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I'm not an expert teacher or lecturer of chemistry. I was only a student from SMA NEGERI 15 SURABAYA who had been one of the Bronze Medalist Participants of Olimpiade Sains Nasional X (2011) of Chemistry In Manado, North Sulawesi, 11 - 16 September 2011 and graduated in 2012. Now, I'm studying at Universitas Airlangga in Surabaya, Indonesia. I do love chemistry and I would like to help them who had difficulties in studying chemistry. That's why, please understand me if you found some misconcepts in my entries. Suggestions are always necessary in order to develop this blog. And I'm sorry because my English isn't so well.

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The Documents

Thursday, December 29, 2011

Thermal Conductivity (k)

Heat can be transferred from a position to another position. There are three types of heat transferred: Conduction, Convection, and Radiation. In this blog, we just discuss about conduction.


(Source: http://www.roasterproject.com/wp-content/uploads/2010/01/heat-transmittance-means1.jpg)

When we heat a spoon of stainless steel and we touch another end of that spoon, soon or later we will fell the heat given to the spoon. What was happened?

All matter consists of atoms and those atoms always move except at 0 K. When we heat an end of spoon, the atoms will accept the transferred energies from the heat source and make them vibrated. To prevent the ground state, energies they got are transferred to the other atoms near them etc. This is what we call as thermal conductivity. See the picture below:


(Source: http://www.vtaide.com/png/images/conduction2.jpg)

Matter has the ability to conduct heat. From this statement, we knew that based on the conductivity, substances could be divided into conductor and isolator. See the list below:



Calculation
See the picture below:


(Source: http://cfbt-us.com/wordpress/wp-content/uploads/2010/03/thermal_conductivity_lr.jpg)

Mathematically, the thermal conductivity can be formulated as follows:

Where:
Q = Heat (J or Cal)
k = Thermal Conductivity (J m-1 K-1 s-1)
T = Temperature (K)
t = Time (s)
L = Length of Material (m)
A = Area of Material (m2)

And we can calculate the heat flow rate flowing through a material as follows:


Where
H = Heat Flow Rate (J/s)

Further Reading . . .
Wikipedia


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