Lesson Plan

• Describe the Kelvin and Celsius temperature scales and their relationship.
• Convert temperatures between Kelvin and Celsius using both the exact (273.15) and approximate (273) offsets.
• Apply the conversion formula to solve problems and avoid common errors.

• Projector or interactive whiteboard
• Whiteboard and markers
• Worksheets with conversion tables
• Scientific calculators
• Printed handout summarising formulas and common mistakes
• Sticky notes for exit tickets

Begin with a quick question: “What temperature would you assign to a star?” This hooks students and highlights the need for an absolute scale. Review that they already know Celsius temperatures from everyday life. State that by the end of the lesson they will reliably move between Kelvin and Celsius and recognise the correct offset.

1. Do‑now (5'): Students complete a short quiz converting three temperatures on the board.
2. Mini‑lecture (10'): Explain absolute vs. relative scales and introduce the formula T(K)=θ(°C)+273.15 (and the 273 approximation).
3. Guided practice (12'): Work through the three worked examples from the notes, prompting students to verbalise each step.
4. Interactive activity (10'): In pairs, students use calculators to convert a set of temperatures, then swap sheets for peer checking.
5. Common mistakes discussion (5'): Highlight errors from the source (wrong offset, symbol confusion, negative Kelvin) and correct them.
6. Independent practice (8'): Worksheet with four practice questions; teacher circulates to provide feedback.
7. Exit ticket (5'): Each student writes one conversion problem and its answer on a sticky note for the teacher to collect.

Summarise that Kelvin and Celsius differ by a constant offset and that careful attention to units prevents common mistakes. Collect the exit tickets to gauge understanding, and assign a short homework sheet of additional conversion problems to reinforce the skill.