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Prep.2 | Science | Methods of Heat Transfer | Unit 1 - Lesson 4

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شرح ساينس الصف الثاني الاعدادي لغات - الفصل الدراسي الاول شرح ساينس الثاني الاعدادي - ترم اول لينك جروب الواتساب https://whatsapp.com/channel/0029VaedgDDId7nLsAeCwg2k لينك تليجرام https://t.me/mrahmedelbashagroup لينك تحميل الملزمة https://drive.google.com/file/d/1uaf-lVvf4Twbgf-SWQS7doLx_wx6soQT/view?usp=sharing In This Part : Methods of Heat Transfer: Conduction, Convection, and Radiation 🌡️🔥 In this video, we explore in detail how heat transfers between objects and its real-life applications: • Heat and Thermal Equilibrium: Heat is energy that transfers from a higher temperature system to a lower temperature system until both reach "thermal equilibrium". The Three Methods of Heat Transfer: 1. Conduction: o The transfer of thermal energy through solid objects from one point to another without the movement of their particles. o Materials are classified into thermal conductors (like diamonds, silver, and copper) and thermal insulators (like wood and plastic). o Life Applications: Cooking utensils are made of metals due to high conductivity, while their handles are made of plastic or wood to insulate heat. Hollow clay bricks and polystyrene panels are used to insulate building walls. Also, good conductors like silver are used in cooling electronic devices. 2. Convection: o The transfer of thermal energy in fluids (liquids and gases) where hotter (less dense) particles rise, and colder (more dense) particles sink. o Life Applications: Space heaters are placed on the floor so warm air rises and cold air descends to replace it. Conversely, freezers are installed at the top of refrigerators so cold air descends and cools the entire space. This method also explains the "sea breeze" phenomenon during the day. 3. Radiation: o The transfer of heat in a vacuum without the need for a material medium (like solar radiation reaching Earth). o Opaque dark objects absorb infrared (thermal) radiation better than shiny, light-colored objects. o Life Applications: Firefighters wear shiny silver clothing to reflect the thermal radiation from flames. Solar heater tubes are painted black to increase their absorption of infrared rays. • Technological and Biological Applications: We also discuss "Thermography," an imaging technique that converts infrared radiation into colored visual images, and how snakes use facial sensory receptors to detect the infrared radiation emitted by their prey at night. بالتوفيق مستر احمد الباشا

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