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1 markDesign and Use of Thermometers

CAPE Physics Unit 1 · 2008 · Paper 2 · Question 3(b)(i)

Figure 2 shows an experimental setup to determine the boiling point of a liquid using a constant volume gas thermometer. The boiling point, t, on the empirical centigrade scale is given by t = 100 * (h - h₀) / (h₁₀₀ - h₀), where h₀, h₁₀₀, and h are heights of the mercury column at 0 °C, 100 °C, and t °C respectively.

How would you ensure that the volume of gas in the bulb is held constant?

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  1. 3(a)List ONE advantage and ONE disadvantage of using a liquid in glass thermometer, a thermocouple and a constant volume gas thermometer to measure temperature.[6 marks]
  2. 3(b)Figure 2 shows the setup of the experimental arrangement to determine the boiling point of a liquid. The following apparatus is available: a constant volume…[1 mark]
  3. 3(b)(ii)Carefully explain how readings are taken to determine a) h₀, the height of the mercury column at 0 °C b) h₁₀₀, the height of the mercury column at 100 °C c) h,…[4 marks]
  4. 3(c)The following results were obtained: h₀ = 5.0 cm h₁₀₀ = 20.0 cm h = 16.8 cm[1 mark]
  5. 3(c)(i)Using the above results, determine the boiling point of the liquid.[1 mark]
  6. 3(c)(ii)Determine the pressure of the gas in the bulb when the liquid is at its boiling point.[3 marks]

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