Thermal Properties And Temperature
Overview
Bridges are built with gaps so they do not buckle in summer, kettles stay at 100 degrees while they boil, and a wet finger feels cold in a breeze. All three are thermal physics in action: expansion, change of state, and the cooling caused by evaporation.
In this lesson you will explain thermal expansion of solids, liquids and gases, describe melting, boiling, condensation and evaporation in terms of particles and energy, and calculate energy changes using specific heat capacity. You will also see why evaporation cools and how to speed it up.
Objectives
- [Core] Describe, qualitatively, the thermal expansion of solids, liquids and gases at constant pressure
- [Core] Describe evaporation in terms of the escape of the more energetic particles from the surface of a liquid
- [Core] Know that evaporation causes cooling of a liquid
- [Supplement] Explain some of the everyday applications and consequences of thermal expansion
- [Supplement] Describe how temperature, surface area and air movement over a surface affect evaporation
Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Thermal Properties And Temperature. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- For the same temperature rise, the greatest expansion is shown by: A. solids B. liquids C. gases D. all expand equally Answer: C
- During boiling, the energy supplied is used to: A. raise the temperature B. break the bonds between particles C. increase the pressure D. cool the liquid Answer: B
- Evaporation cools a liquid because: A. the slowest particles escape B. the most energetic particles escape, lowering the average energy C. the liquid gains energy D. the temperature rises Answer: B
- How much energy raises 2 kg of water by 10 C? (c = 4200 J/(kg C)) A. 8400 J B. 21 000 J C. 84 000 J D. 4200 J Answer: C
- Water boils at standard atmospheric pressure at: A. 0 C B. 50 C C. 100 C D. 273 C Answer: C
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Recommended Books
Practice Mock Questions
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