https://www.khanacademy.org/science/in-in-class11th-physics/in-in-thermal-properties-of-matter/in-in-thermal-expansion-in-solids/v/linear-expansion-class-11-india-physics-khan-academy 2020-06-23T07:22:43Z Linear expansion How much does iron expand on heating? How do you answer such questions? How do we assign a number to thermal expansion? In this video, we are going to explore how we can quantify thermal expansion of solids. We will start with linear expansion. Created by Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/8IIa4LYZ3_3rwudVFWLGDeR8YYFje7aOmC033e8k30caFMUJLQsfeOi0sbWQ2QwqBTDixUsxZvI5GLIkXicQyKtQbg Linear expansion How much does iron expand on heating? How do you answer such questions? How do we assign a number to thermal expansion? In this video, we are going to explore how we can quantify thermal expansion of solids. We will start with linear expansion. Created by Mahesh Shenoy https://cdn.kastatic.org/ka-youtube-converted/wT2ylH3wskE.mp4/wT2ylH3wskE.mp4 699 Thermal Properties of matter https://www.khanacademy.org/science/in-in-class11th-physics/in-in-thermal-properties-of-matter/in-in-thermal-expansion-in-solids/v/thermal-expansion-of-ring-class-11-india-physics-khan-academy 2020-06-23T07:22:41Z Thermal expansion of ring How much does the ring expand on heating. This is a problem that seems quite complicated, but it's actually a linear expansion problem. In this video we will explore how to tackle such problems. Created by Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/SFgFN0u5nRb1EeJP_eX1JAY3FLOMzwN9KVgzK55PsZo-y1bnqWkwWstLqyg4JnjW4DKeEWTeQsw5vaHKlvXG3rmI9w Thermal expansion of ring How much does the ring expand on heating. This is a problem that seems quite complicated, but it's actually a linear expansion problem. In this video we will explore how to tackle such problems. Created by Mahesh Shenoy https://cdn.kastatic.org/ka-youtube-converted/7KW_tWYNO-I.mp4/7KW_tWYNO-I.mp4 715 Thermal Properties of matter https://www.khanacademy.org/science/in-in-class11th-physics/in-in-thermal-properties-of-matter/in-in-thermal-expansion-in-solids/v/area-expansion-coefficient-class-11-india-physics-khan-academy 2020-06-23T07:22:42Z Area expansion coefficient Let's explore how to calculate changes in areas of things, when they are heated. By the way changes in area is also called superficial expansion. The good thing is we don't need more physics. We can use whatever we learnt in linear expansion and just apply here. We will eventually define the area expansion coefficient. Created by Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/GJOC4t5cPTxDwRITXXM3eP6qLJ_5H3YSOpFjlPM1ePmHOxyx-8ZAf8srnXdqptjmGlcLXLv_E84bIu01SuLPiLVCkw Area expansion coefficient Let's explore how to calculate changes in areas of things, when they are heated. By the way changes in area is also called superficial expansion. The good thing is we don't need more physics. We can use whatever we learnt in linear expansion and just apply here. We will eventually define the area expansion coefficient. Created by Mahesh Shenoy https://cdn.kastatic.org/ka-youtube-converted/vhBh_SYH4v4.mp4/vhBh_SYH4v4.mp4 557 Thermal Properties of matter https://www.khanacademy.org/science/in-in-class11th-physics/in-in-thermal-properties-of-matter/in-in-thermal-expansion-in-solids/v/volume-expansion-coefficient-class-11-india-physics-khan-academy 2020-06-23T07:22:42Z Volume expansion coefficient Let's explore the calculation of volume expansion due to temperature change. Good news is we don't need more physics. We can just use the stuff we learnt in linear expansion and apply it over here. Eventually we will define volume expansion coefficient. Created by Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/UrgWRRC7a0jrwKQth-BrcUqLD7syXHO4NuUh6fu_E85_fqEQ6l9S2eXZVz8nQASVw3kCcz5u-xTmw-bCx-W-GWVp Volume expansion coefficient Let's explore the calculation of volume expansion due to temperature change. Good news is we don't need more physics. We can just use the stuff we learnt in linear expansion and apply it over here. Eventually we will define volume expansion coefficient. Created by Mahesh Shenoy https://cdn.kastatic.org/ka-youtube-converted/BaUudFaykPg.mp4/BaUudFaykPg.mp4 301 Thermal Properties of matter https://www.khanacademy.org/science/in-in-class11th-physics/in-in-thermal-properties-of-matter/in-in-thermal-expansion-in-solids/e/thermal-expansion-theoretical 2026-04-08T01:15:04.085520103Z Thermal expansion - theoretical Let's solve some problems to test our understanding of the theoretical aspects of thermal expansion. Aakash Bagga exercise https://www.khanacademy.org/science/in-in-class11th-physics/in-in-thermal-properties-of-matter/in-in-thermal-expansion-in-fluids/v/thermal-expansion-in-liquids-class-11-india-physics-khan-academy 2020-11-16T17:29:52Z Thermal expansion in liquids How do we quantify expansion coefficient in liquids? Unlike solids, liquids don't have a definite shape or size, so we need to be careful while thinking of expansion coefficients. In this video, we will see what's the best way to quantify expansion coefficients fo liquids. Created by Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/THMEPyxiIuray1JzLuW5_Mg9_BhzC_7IR2OtsenFCpbDgSBaXVL4YE_ktuw-j7dSyfycx_6ja3ww23Unlv0L1r2e Thermal expansion in liquids How do we quantify expansion coefficient in liquids? Unlike solids, liquids don't have a definite shape or size, so we need to be careful while thinking of expansion coefficients. In this video, we will see what's the best way to quantify expansion coefficients fo liquids. Created by Mahesh Shenoy https://cdn.kastatic.org/ka-youtube-converted/8o9gCi121Rk.mp4/8o9gCi121Rk.mp4 501 Thermal Properties of matter https://www.khanacademy.org/science/in-in-class11th-physics/in-in-thermal-properties-of-matter/in-in-thermal-expansion-in-fluids/v/thermal-expansion-in-gas-class-11india-physics-khan-academy 2020-11-16T17:29:53Z Thermal expansion in gas How to quantify thermal expansion coefficient for gases? Gases are little different than solids and liquids because they neither have definite shape or volume. So we need to be careful while defining its expansion coefficient. In this video, we will explore this in detail :) Created by Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/HtFjm4m1G1hlF3lgVtocFPHwvWTWfcMuytAV2o5j2qEy1fMrWIDp8i8aRgbSfnUti86GLoraezy7IBavlyocs1g Thermal expansion in gas How to quantify thermal expansion coefficient for gases? Gases are little different than solids and liquids because they neither have definite shape or volume. So we need to be careful while defining its expansion coefficient. In this video, we will explore this in detail :) Created by Mahesh Shenoy https://cdn.kastatic.org/ka-youtube-converted/FdUuLpdqiA8.mp4/FdUuLpdqiA8.mp4 622 Thermal Properties of matter https://www.khanacademy.org/science/in-in-class11th-physics/in-in-thermal-properties-of-matter/in-in-thermal-expansion-in-fluids/v/anomalous-expansion-of-water-class-11-india-physics-khan-academy 2020-10-20T15:14:00Z Anomalous expansion of water Why does ice float on water? You may already know that ice is less dense than water, but why? Usually, solids are denser than liquids. In this video, we will explore the Anomalous expansion of water, and understand what makes ice less dense than water. We also look at some other consequences of this phenomenon. Created by Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/pJdfDml0uhq-vorKpRCibT6MGe5jlOHexWBu6uknXqpSlgiVo_IFJePtds2c90eHsI2LT-cpDcdtx9GL0h4kW3Q Anomalous expansion of water Why does ice float on water? You may already know that ice is less dense than water, but why? Usually, solids are denser than liquids. In this video, we will explore the Anomalous expansion of water, and understand what makes ice less dense than water. We also look at some other consequences of this phenomenon. Created by Mahesh Shenoy https://cdn.kastatic.org/ka-youtube-converted/adUU1AsWwVI.mp4/adUU1AsWwVI.mp4 605 Thermal Properties of matter https://www.khanacademy.org/science/in-in-class11th-physics/in-in-thermal-properties-of-matter/in-in-thermal-expansion-in-fluids/e/anomalous-expansion-of-water 2026-04-08T01:15:04.085520103Z Anomalous expansion of water Let's solve some problems to better understand the anomalous behavior of water when it expands. Aakash Bagga exercise https://www.khanacademy.org/science/in-in-class11th-physics/in-in-thermal-properties-of-matter/in-in-specific-heat-and-heat-transfer/v/heat-transfer-high-school-physics 2022-09-08T02:59:50.812572544Z Heat transfer Uncontrolled systems always evolve toward more stable states—that is, toward more uniform energy distribution (e.g., water flows downhill, objects hotter than their surrounding environment cool down). Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/e4ad66c3-ba86-4568-bfa3-f536596a5eff_1280_720_base.png Heat transfer Uncontrolled systems always evolve toward more stable states—that is, toward more uniform energy distribution (e.g., water flows downhill, objects hotter than their surrounding environment cool down). https://cdn.kastatic.org/ka-youtube-converted/FPPv1mkRpKw.mp4/FPPv1mkRpKw.mp4 364 Thermal Properties of matter https://www.khanacademy.org/science/chemistry/states-of-matter-and-intermolecular-forces/states-of-matter/v/specific-heat-and-latent-leat-of-fusion-and-vaporization-2 2021-01-04T18:35:20Z Specific heat and latent heat of fusion and vaporization Defining specific heat, heat of fusion, and heat of vaporization. How to calculate the amount of heat to change the temperature of water and the energy required to change for a phase change.  David SantoPietro video https://cdn.kastatic.org/googleusercontent/EoJKriLCVHC5RIlLzeIMyJCOBrnLWnpttzxDUgjLMvtkTddPUqNW3DULUwbd-ZzCGg5-yTay-SlsWhJxlDIdmDM Specific heat and latent heat of fusion and vaporization Defining specific heat, heat of fusion, and heat of vaporization. How to calculate the amount of heat to change the temperature of water and the energy required to change for a phase change.  https://cdn.kastatic.org/ka-youtube-converted/WU7TfO-iaK8.mp4/WU7TfO-iaK8.mp4 897 Thermal Properties of matter https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:thermodynamics/x0e2f5a2c:thermal-energy-and-thermal-equilibrium/e/understand-thermodynamics 2025-03-12T14:20:10.072734823Z Understand: thermodynamics Check your understanding of thermodynamics in this set of free practice questions aligned to NGSS standards. exercise https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:thermodynamics/x0e2f5a2c:thermal-energy-and-thermal-equilibrium/e/apply-thermodynamics 2025-03-12T14:20:10.072734823Z Apply: thermodynamics Apply your understanding of thermodynamics in this set of free practice questions aligned to NGSS standards. exercise https://www.khanacademy.org/science/revision-term-2-jnv-physics-grade-11/x077d246dcd1fe558:week-2/x077d246dcd1fe558:thermal-properties-of-matter/v/thermal-conduction-convection-and-radiation 2022-11-16T04:22:43.7414897Z Thermal conduction, convection, and radiation There are three forms of thermal energy transfer: conduction, convection, and radiation. Conduction involves molecules transferring kinetic energy to one another through collisions. Convection occurs when hot air rises, allowing cooler air to come in and be heated. Thermal radiation happens when accelerated charged particles release electromagnetic radiation, which can be felt as heat. video https://cdn.kastatic.org/googleusercontent/Hv0IoKraecmYL6pTEVTae9WcA_YqO7CTECyExWRxNubSsIz_lLldwJzKU-9lyrnn1meIsQR_7ZA93YKe2E-EzMzl Thermal conduction, convection, and radiation There are three forms of thermal energy transfer: conduction, convection, and radiation. Conduction involves molecules transferring kinetic energy to one another through collisions. Convection occurs when hot air rises, allowing cooler air to come in and be heated. Thermal radiation happens when accelerated charged particles release electromagnetic radiation, which can be felt as heat. https://cdn.kastatic.org/ka-youtube-converted/8GQvMt-ow4w.mp4/8GQvMt-ow4w.mp4 550 Thermal Properties of matter https://www.khanacademy.org/science/revision-term-2-jnv-physics-grade-11/x077d246dcd1fe558:week-2/x077d246dcd1fe558:thermal-properties-of-matter/e/thermal-conduction-basic 2025-03-07T16:50:49.734868403Z Thermal conduction (basic) Let's solve some problems where we directly apply the formula for thermal conduction and better understand the various terms in it. Aakash Bagga exercise https://www.khanacademy.org/science/revision-term-2-jnv-physics-grade-11/x077d246dcd1fe558:week-2/x077d246dcd1fe558:thermal-properties-of-matter/e/thermal-conductivity-intermediate 2026-04-08T00:36:09.500768563Z Thermal conductivity - rods connected at a junction Let's solve some problems where we apply the concept of heat transfer through conduction to find junction temperatures and heat current flowing through rods who are joined at a junction. Aakash Bagga exercise https://www.khanacademy.org/science/revision-term-2-jnv-physics-grade-11/x077d246dcd1fe558:week-2/x077d246dcd1fe558:thermal-properties-of-matter/e/equivalent-thermal-conductivity 2026-04-08T00:36:09.500768563Z Equivalent thermal conductivity Let's solve some problems to better understand how to find the equivalent thermal conductivity of a combination of rods. Aakash Bagga exercise https://www.khanacademy.org/science/in-in-class11th-physics/in-in-thermal-properties-of-matter/in-in-thermal-stress/v/thermal-stress-class-11-india-physics-khan-academy 2021-01-15T14:38:31Z Thermal stress When a heated glass is suddenly cooled, it shatters. Why? When things are not free to expand, they end up developing stress, called thermal stress. In this video, we will explore this concept of thermal stress with the help of a numerical Created by Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/EOg6asuLcx56-yjE-dUA5xQu-N2YGFmPyxwuqr107LgD4KqkaKiC2DmsunU4qGuYVpNFuB0bubzRVj8e4qM5DXI Thermal stress When a heated glass is suddenly cooled, it shatters. Why? When things are not free to expand, they end up developing stress, called thermal stress. In this video, we will explore this concept of thermal stress with the help of a numerical Created by Mahesh Shenoy https://cdn.kastatic.org/ka-youtube-converted/Q6_lnkwKOaQ.mp4/Q6_lnkwKOaQ.mp4 674 Thermal Properties of matter https://www.khanacademy.org/science/revision-term-2-jnv-physics-grade-11/x077d246dcd1fe558:week-2/x077d246dcd1fe558:thermal-properties-of-matter/e/stefanboltzmann-law 2025-06-30T11:35:29.115562617Z Stefan–Boltzmann Law Stefan–Boltzmann Law Chandan Ganotra exercise https://www.khanacademy.org/science/revision-term-2-jnv-physics-grade-11/x077d246dcd1fe558:week-2/x077d246dcd1fe558:thermal-properties-of-matter/e/wien-s-displacement-law 2025-06-30T11:35:29.115562617Z Wien's Displacement Law Wien's Displacement Law Chandan Ganotra exercise