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You carried out an experiment to establish the calibration curve of a thermometer - Leaving Cert Physics - Question 2 - 2012
Question 2
You carried out an experiment to establish the calibration curve of a thermometer. (i) Describe, with the aid of a diagram, the procedure you used in the experiment... show full transcript
Worked Solution & Example Answer:You carried out an experiment to establish the calibration curve of a thermometer - Leaving Cert Physics - Question 2 - 2012
Step 1
Describe, with the aid of a diagram, the procedure you used in the experiment.
Answer
To establish the calibration curve of a thermometer, the following procedure was followed:
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Equipment Setup:
- A beaker was filled with water and placed on a heat source (like a Bunsen burner).
- The thermometer was immersed in the water.
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Measurement Process:
- The water was heated, and the temperature was recorded at various points (0°C, 20°C, 40°C, 60°C, 80°C, and 100°C).
- At each temperature, two readings of the thermometer property were taken to ensure accuracy.
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Data Collection:
- Values of the thermometric property were noted down based on the thermometer readings at these set temperatures.
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Diagram:
- A labeled diagram would include the thermometer immersed in the water with temperature markings and the heat source.
Step 2
Name the thermometric property of the thermometer you calibrated and describe how the value of this property was measured.
Answer
The thermometric property calibrated is the resistance of the thermistor.
- Measurement Technique:
- The resistance was measured using an ohmmeter at various temperatures.
- As the temperature changed, the resistance of the thermistor varied, which was recorded.
- The relationship between temperature and resistance indicates how the thermometric property varies with temperature.
Step 3
Using the data in the table, draw a graph on graph paper to establish the calibration curve. Put temperature on the horizontal axis.
Answer
To draw the calibration curve:
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Graph Setup:
- Set up graph paper with temperature on the horizontal axis and the value of the thermometric property on the vertical axis.
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Plot Points:
- Plot the following points from the table: (0, 5), (20, 14), (40, 29), (60, 48), (80, 80), and (100, 130).
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Connecting Points:
- Draw a smooth curve through the points to represent the calibration curve.
Step 4
Use your calibration curve to determine the temperature when the value of the thermometric property is 60.
Answer
To determine the temperature for a thermometric property value of 60:
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Locate the point:
- On the calibration curve, find the point where the thermometric property value is 60.
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Read the corresponding temperature:
- Draw a horizontal line at the value of 60 until it intersects with the calibration curve.
- Read down vertically to find the corresponding temperature, which approximately falls between 70°C and 80°C, likely about 72°C.