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4.1 Understanding Thermal Equilibrium


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4.1 Understanding Thermal Equilibrium

  1. 1. 4.1 Thermal equilibrium Misconception Cannot distinguish between energy , heat and temperature. Construction of concept through effective questioning Topic: Understanding Thermal Equilibrium . Approach: Constructivism Method: Hands – on Activity and Effective Questioning Sequence Implementing strategy: Perform a simple activity followed by effective questioning technique to build the concept of thermal equilibrium. Activity 1: A few students are given clinical thermometers and asked to state the reading Q1 . What is the room temperature now ? (Accept any answer) (A1: 28 0 C to 30 0 C) Activity 2: Ask two students to put the thermometers under their tongues Student A (Time: 30 seconds) Student B (Time: 5 minutes) Ask the students to compare the reading on the thermometer between them Q 3: Which student has a higher temperature ? Which student has a lower temperature ? (A3: B is higher than A)
  2. 2. Q 4: Why temperature A is lower than temperature B ? Why temperature B is higher than temperature A ? (A4: Because the temperature have not reach equilibrium) Based on the answer Q 3 and Q4 , ask the student the correct way to use the thermometer Q5 . Which is the correct reading of the body temperature ? (A5: Student B) Q6. Why should we put the thermometer under the tongue ? (A6 :There is thermal contact between two bodies or rate of heat flow is equal between the two bodies) Ask the student to relate between the heat and thermal equilibrium Q7. Why the reading of thermometer increases ? (A7: Heat transfer from higher temperature body to lower temperataure body) Q8. Why we have to wait for a few minutes before taking the reading of the thermometer ? (A8: For both the body and thermometer to reach the same temperature . The rate of heat flow is equal . The body and temperature are at thermal equilibrium) Applications of thermal equilibrium Ask the students to give another example where the concept of thermal equilibrium is applied in daily life Q9. Can you give another example where the thermal equilibrium is applied in our daily life? (A9: The cooling of a cup of hot tea)