Describe an experiment to determine thermal conductivity of glass.

Describe an experiment to determine thermal conductivity of glass.

• Glass s cut in form of a thin disc of cross section area, A and thickness, x.
• The disc is sandwiched between a steam chest and brass slab of mass, m and specific heat capacity, c.
• Steam is passed through the chest until the thermometers register steady temperatures, θ₁ and θ₂.

• The glass disc is removed and brass slab is heated directly by steam chest, until its temperature is about 10⁰C above θ₁.
• Steam chest is removes and the top of the glass slab is covered by the glass disc.
• The temperature of the slab is recorded at suitable time interval until its temperature is about 100C below θ₁.
• A graph of temperature against time is plotted and its slope s determined at θ₁

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