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Difficulty: MediumAnalyzing Experimental Procedures and Apparatus

Experiment 1
Students constructed a constant-volume gas thermometry apparatus to calibrate a high-precision temperature sensor by measuring pressure changes in a gas sample across various temperatures. The experimental assembly includes a constant-volume gas bulb, a variable-temperature oil bath, a mercury manometer, and a vacuum desiccant trap.

Match each apparatus component to its primary procedural function in the experiment.

  • Constant-volume gas bulbConfines a fixed quantity of gas so its volume remains unchanged as temperature varies.
  • Variable-temperature oil bathRegulates and maintains the gas sample at a uniform, specified temperature during measurement trials.
  • Mercury manometerMeasures the pressure exerted by the enclosed gas sample relative to atmospheric pressure.
  • Vacuum desiccant trapAbsorbs trace atmospheric moisture from the system manifold to prevent water vapor pressure interference.

Answer

The constant-volume gas bulb confines a fixed quantity of gas; the variable-temperature oil bath regulates and maintains the gas sample at a uniform temperature; the mercury manometer measures gas pressure; and the vacuum desiccant trap absorbs trace moisture to prevent interference.
Each component serves a distinct procedural role in the gas thermometry experiment: the gas bulb holds the sample at constant volume, the oil bath maintains thermal uniformity, the manometer records pressure data, and the desiccant trap prevents moisture contamination from skewing pressure readings.

Step-by-Step Solution

1
Analyze the role of the container holding the gas.
The constant-volume gas bulb ensures that the volume term (VV) in the ideal gas law remains constant, allowing temperature-pressure relationships to be measured accurately.
Procedural control requires maintaining constant volume when testing Gay-Lussac's Law.
2
Analyze the thermal regulation apparatus.
The variable-temperature oil bath provides uniform heating around the bulb, controlling the independent variable (temperature).
Liquid baths prevent localized hot spots and allow precise temperature control.
3
Analyze the pressure-measuring instrument.
The mercury manometer records pressure differences created by the expanding/contracting gas.
Manometers measure fluid pressure differentials.
4
Analyze the contamination control component.
The desiccant trap removes water vapor from the manifold.
Water vapor in the line would vaporize or condense, introducing confounding partial pressures.

Key Concept

Function and design of experimental apparatus components in gas thermodynamics procedures
Estimated Time:1m 30s
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Topics

Analyzing Experimental Procedures and Apparatus

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