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Define coefficient of thermal conductivi...

Define coefficient of thermal conductivity and temperature gradient.

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``The coefficent of thermal conductivity ``(K) it is the quantity of heat flowing normally per second through unit area of the substance per unit temperature gradient.
`K=(Q.L)/(A(theta_(2)-theta_(1)t)`
``Temperature gradient `` is defined as the change in temperature along the conductor per unit length. Temperature gradient
Change in temperature
`("between the ends")/("Length of conductor")=(0_(2)-0_( 1))/(1)`
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Explain thermal conductivity and coefficient of thermal conductivity. A copper bar of thermal conductivity 401 W (mk) has one end at 104^@C and the other end at 24^@C . The length of the bar is 0.10 m and the cross-sectional area is 1.0 xx 10^(-6) m^(-2) . What is the rate of heat conduction along the bar ?

SI unit of coefficient of thermal conductivity is

Knowledge Check

  • Graphs give the temperature along an x-axis that extends directly through a wall consisting of three layers with different, nonzero and finite coefficient of thermal conductivities. The air temperature on both sides of the wall are different and uniform. Out of the situations as shown by the graph, which is/are impossible?

    A
    B
    C
    D

  • SI unit of coefficient of thermal conductivity

    A
    `Wm^(-1)K^(-1)`
    B
    `Wm^(-2)K^(-1)`
    C
    `Wm K^(-1)`
    D
    `Wm K^(-2 )`

  • SI unit of coefficient of thermal conductivity is

    A
    `Wm^(-1) K^(-1)`
    B
    `Wm^(-2) K^(-1)`
    C
    Wm `K^(-1)`
    D
    `Wm^(-1) K^(-2)`

    • Similar Questions

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    (A) : Greater is the coefficient of thermal conductivity of a material, smaller is the thermal resistance of a rod of that material. ( R): Thermal resistance is the ratio of temperature difference between the ends of the conductor and rate of flow of heat.

    The coefficients of thermal conductivity of copper, mercury and glass are respectively k_(c),k_(m) and k_(g) such that k_(c)gt k_(m)gt k_(g) . If the same quantity of heat is to flow per second per unit area of each and corresponding temperature gradient are X_(c),X_(m) and X_(g) :

    Two metal rods A and B of equal lengths and equal cross- sectional areas are joined end to end. The coefficients of thermal conductivities of A and B are in ratio 2 : 3 , when the free end of A is maintained at 100^(@)C , free end of B at 0^(@)C , the temperature of the junction is

    S.I. Unit of temperature gradient is

    S.I. Unit of temperature gradient is

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