Question

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1) Write the expression for the thermal conductivity and also write its S.I and C.G.S unit?
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Answer 1

THERMAL CONDUCTIVITY

☞Thermal conductivity is defined as the measure of a material’s ability to conduct heat. It is denoted by K

➳Formula of thermal conductivity

K = QL/A(ΔT)t

◈SI unit of thermal conductivity

K = W/mK or J/smK

◈CGS unit of thermal conductivity

K = erg/scmK

EXTRA POINTS:

• The inverse of thermal conductivity is thermal resistivity.

• Order of thermal conductivity Ag > Cu > Au > Al

• For Ag thermal conductivity = 410 W/mK (Maximum value)

• For an ideal or perfect insulator k = 0

• Dimensional formula $M^1L^1T^{-3}\theta^{-1}$ Here Θ is temperature in kelvin.

NOTE: REFER ATTACHMENT FOR DERIVATION AND DIAGRAM.