Thermal Properties And Temperature
Aperçu
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.
Objectifs
- Describe, qualitatively, the thermal expansion of solids, liquids and gases at constant pressure
- Describe some of the everyday applications and consequences of thermal expansion
- Know that a rise in the temperature of an object increases its internal energy
- Describe melting and boiling in terms of energy input without a change in temperature
- Know the melting and boiling temperatures for water at standard atmospheric pressure
- Describe condensation and solidification in terms of particles
- Describe evaporation in terms of the escape of more-energetic particles from the surface of a liquid
- Know that evaporation causes cooling of a liquid
- [Supplement] Explain, in terms of the motion and arrangement of particles, the relative order of magnitudes of the expansion of solids, liquids and gases as their temperatures rise
- [Supplement] Describe an increase in temperature of an object in terms of an increase in the average kinetic energies of all of the particles in the object
- [Supplement] Define specific heat capacity as the energy required per unit mass per unit temperature increase; recall and use the equation ∆E c = m∆θ
- [Supplement] Describe experiments to measure the specific heat capacity of a solid and a liquid
- [Supplement] Describe the differences between boiling and evaporation
- [Supplement] Describe how temperature, surface area and air movement over a surface affect evaporation
- [Supplement] Explain the cooling of an object in contact with an evaporating liquid
Lecon audio
Ecoutez cette lecon dans l'application
Carte mentale
Ce theme est schematise pour montrer comment les idees se relient.
Ouvrez la carte mentale dans l'application
Cartes memoire
Entrainement rapide sur les faits evalues dans ce theme.
Entrainez-vous sur ces cartes dans l'application
Note de cours
Fiche complete disponible sur l'application Green Bridge
Installez l'application Green Bridge CBT sur votre telephone ou votre ordinateur pour acceder a toute la bibliotheque IGCSE : sujets d'examen, baremes, cartes mentales, fiches memo et lecons audio.
Évaluation de la leçon
Félicitations, vous avez terminé la leçon sur Thermal Properties And Temperature. Maintenant que vous avez exploré le concepts et idées clés, il est temps de mettre vos connaissances à lépreuve. Cette section propose une variété de pratiques des questions conçues pour renforcer votre compréhension et vous aider à évaluer votre compréhension de la matière.
Vous rencontrerez un mélange de types de questions, y compris des questions à choix multiple, des questions à réponse courte et des questions de rédaction. Chaque question est soigneusement conçue pour évaluer différents aspects de vos connaissances et de vos compétences en pensée critique.
Utilisez cette section d'évaluation comme une occasion de renforcer votre compréhension du sujet et d'identifier les domaines où vous pourriez avoir besoin d'étudier davantage. Ne soyez pas découragé par les défis que vous rencontrez ; considérez-les plutôt comme des opportunités de croissance et d'amélioration.
- 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
Travaillez ces questions dans l'application
Travaillez ces questions dans l'application
Livres recommandés
Pour aller plus loin, ressources libres
-
Section de manuel
Thermal Expansion of Solids and Liquids
The expansion of alcohol in a thermometer is one of many commonly encountered examples of thermal expansion , the change in size or volume of a given mass with temperature. Hot air rises because its volume increases, which causes the hot air’s density to be smaller than the density of surrounding ai
"College Physics: Thermal Expansion of Solids and Liquids" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/college-physics/pages/13-2-thermal-expansion-of-solids-and-liquids. Access for free at https://openstax.org/books/college-physics/pages/1-introduction
-
Section de manuel
Humidity, Evaporation, and Boiling
The expression “it’s not the heat, it’s the humidity” makes a valid point. We keep cool in hot weather by evaporating sweat from our skin and water from our breathing passages. Because evaporation is inhibited by high humidity, we feel hotter at a given temperature when the humidity is high. Low hum
"College Physics: Humidity, Evaporation, and Boiling" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/college-physics/pages/13-6-humidity-evaporation-and-boiling. Access for free at https://openstax.org/books/college-physics/pages/1-introduction
Publiées par d'autres organisations sous licence libre, créditées comme elles le demandent. Les liens ouvrent leurs sites.
Pratiquez des questions blanches
Vous voulez vous entraîner sur des questions blanches sur Thermal Properties And Temperature ? Téléchargez lapplication Green Bridge CBT pour accéder à des questions blanches et à des évaluations complètes sur ce sujet.
Téléchargez l'application sur Google Play.
Tout ce dont vous avez besoin pour exceller au JAMB, WAEC et NECO.
