| Lesson Plan |
| Grade: |
Date: 25/02/2026 |
| Subject: Physics |
| Lesson Topic: understand that a physical property that varies with temperature may be used for the measurement of temperature and state examples of such properties, including the density of a liquid, volume of a gas at constant pressure, resistance of a metal, e.m |
Learning Objective/s:
- Describe how temperature relates to average kinetic energy and why the Kelvin scale is preferred in physics.
- Explain the key criteria that make a physical property suitable as a thermometer.
- Identify at least three temperature‑dependent properties (liquid density, gas volume, metal resistance, thermocouple e.m.f.) and write the governing equations.
- Apply a calibration procedure to convert a measured property into a temperature value.
- Compare the advantages and limitations of different thermometric methods.
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Materials Needed:
- Projector and screen
- Worksheet with property data and calibration tables
- Digital voltmeter or multimeter
- Thermocouple kit (copper‑constantan)
- Graduated cylinder and water bath (for density demo)
- Gas syringe (constant‑pressure volume demo)
- Resistive wire sample and power supply
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Introduction:
Begin with a quick discussion of everyday thermometers and ask students how they think temperature is actually measured. Review the Kelvin scale and its link to kinetic energy. State that by the end of the lesson they will be able to evaluate and use physical properties as temperature sensors.
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Lesson Structure:
- Do‑now (5'): short quiz on Celsius, Fahrenheit, Kelvin conversions.
- Mini‑lecture (10'): introduce thermometric properties and the four key criteria.
- Demonstration (8'): density of water vs temperature using a graduated cylinder; students record observations.
- Group activity (12'): using provided resistance data, calculate temperature via the linear R‑T equation.
- Thermocouple demo (10'): show voltage reading, discuss Seebeck coefficient and calibration curve.
- Check for understanding (5'): exit‑ticket – one advantage of each property discussed.
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Conclusion:
Summarise how each property can serve as a thermometer and the importance of calibration. Collect exit tickets and highlight common misconceptions. Assign homework: students choose a property not covered, research its temperature relationship, and prepare a brief report.
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