Explain clearly the steps taken to determine the cooling correction when measuring the specific heat capacity of a poor conductor by the method of mixtures.

Explain clearly the steps taken to determine the cooling correction when measuring the specific heat capacity of a poor conductor by the method of mixtures.

• Pour a liquid in a calorimeter and place it on a table
• Place a thermometer into the liquid and after sometime, record the temperature of the surroundings, θ₀.
• Gently place a hot solid into the liquid and stir.
• Record the temperature of the mixture at suitable interval until the temperature of the mixture has fallen by about 1⁰C below the observed maximum temperature, θ₁.
• Plot a graph of temperature against time

• The broken line shows how we would expect the temperature to rise if no heat were lost and the difference, P, between the plateau of this imaginary curve, and the crest of the experimental curve, E. is known as the ‘cooling correction’
• Draw a line AC through θ₀ parallel to the time axis.
• Draw a line BE through θ₁ parallel to the temperature axis.
• Draw a line CD beyond BE parallel to the temperature axis and note Δθ
• Estimate the area A₁ and A₂ under the graph by counting the square on the graph paper
• Cooling correction, P s given by the graph

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