While measuring the thermal conductivity of liquids the upper part is kept hot and lower cooled so that .

While measuring the thermal conductivity of a liquid, we keep the upper part hot and lower part cool, so that

While measuring the thermal conductivity of a liquid we keep the upper part hot and the lower part cool so that,

Assertion : While measuring the thermal conductivity of liquid experimentally, the upper layer is kept hot and the lower layer kept cold. Reason : This avoids heating of liquid by convection.

Assertion : The S.I. unit of thermal conductivity is watt m ^(1)1 K^(1) . Reason : Thermal conductivity is a measure of ability of the material to allow the passage of heat through it.