Convection

Physics - Energy - Heat Transfer - Convection

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Duration: 2:08
Updated: 05 Jan 2014
views: 33408

A Physics revision video explaining the process of heat transfer by Convection.

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Convection Demos

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Duration: 4:31
Updated: 14 Mar 2013
views: 103360

Convection appears in many systems in the universe. A heated fluid will expand, increasing the volume, and decreasing the density so the heated fluid floats in its surroundings. When cooled the fluid will sink in its surroundings. This movie highlights 2 demonstrations used in science class. Demo #1 is the Chimney Demo (a.k.a the RED SMOKER) while Demo #2 highlights special convection fluid being heated. We find convection in earth's mantle and believe it drives earth's plates. Ocean currents are driven by convection. Our winds are driven by temperature differences that cause convection and thus air movement. Finally we believe that convection plays a role at the surface of the sun where its evidence is found in the granulation we see. This Video was originally posted 1 year ago and had 152 views. I added the convection fluid clips and re-uploaded it.

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Heat Transfer - Convection

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Duration: 2:21
Updated: 24 Mar 2013
views: 28542

A simple demonstration of convection. Come see the rest of my videos at www.anglesandacid.com

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CONVECTION WITH THE SCIENCE GEEKS

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Duration: 7:50
Updated: 16 Apr 2013
views: 62555

Convection! Who cares? You should! Discover how heat is transferred in liquids and gases! How convection effects us through wind, earthquakes and its implications in the home! How do sea breezers occur? Ocean currents? How does it heat rooms? It's all explained here, whether you like it or not!

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Lecture 21 (2014). Fundamentals of convection heat transfer (1 of 3)

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Duration: 48:59
Updated: 19 Mar 2014
views: 31569

In this lecture an introduction is given on the fundamentals of convection. The following is discussed: physical mechanism of convection, forced convection, natural convection, heat transfer coefficient, the velocity boundary layer, no-slip velocity on surface, calculation of heat transfer from the temperature gradient at a surface, Nusselt number, and physical significance of Nusselt number. The lecture was presented as part of a heat transfer class to the fourth year students of the Department of Mechanical and Aeronautical Engineering by Prof Josua Meyer, Head of the Department of Mechanical and Aeronautical Engineering of the University of Pretoria, South Africa. Lecture was presented on 19 March 2014.

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Heat Transfer: Conduction, Convection, and Radiation

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Duration: 3:25
Updated: 14 Jun 2012
views: 266291

Descriptions and pictures. Middle School level.

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What Are Convection Currents? - Mr. Wizard's Supermarket Science

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Duration: 4:17
Updated: 07 May 2014
views: 8613

Mr. Wizard demonstrates what convection currents are. Subscribe now for more science, nature and technology clips from the 1980's Nickelodeon show, Mr. Wizard's World, every week on #WizardWednesdays.

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Convection Currents

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Duration: 0:37
Updated: 26 Mar 2008
views: 217843

Using a small fish tank filled with water placed over a bowl of hot water and a bowl of ice, the convection currents can be seen using red and blue food dye. A great demo for school science.

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Convection Currents

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Duration: 3:43
Updated: 26 Mar 2012
views: 57321

This video features a demonstration I performed for my 6th grade science class. It shows how convection occurs in the mantle of the earth and its relationship to the theory of Plate Tectonics.

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Colorful Convection Currents - Sick Science! #075

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Duration: 1:02
Updated: 15 Feb 2012
views: 163257

Learn more at http://www.stevespanglerscience.com/content/experiment/colorful-convection-currents Convection is one of those words that we often hear used, but we may not completely understand its meaning. Weather forecasters show how convection currents are formed when warm and cold air masses meet in the atmosphere. Convection currents are responsible for warm water currents that occur in oceans. This activity demonstrates convection currents in a very colorful fashion. Want more experiments like this? Check out http://www.stevespanglerscience.com/product/naked-eggs-and-flying-potatoes Sick Science™ is a trademark of Steve Spangler, inc. © 2012 Steve Spangler Science all rights reserved

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AQA Core Science Convection

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Duration: 9:56
Updated: 14 Jan 2012
views: 122852

A short video explaining how convection works. This is for GCSE science and applies to various exam boards. Check the website for a complete video list that covers Core (all unit 1s), Additional (all unit 2s) and Separate Science (all unit 3s). www.my-GCSEscience.com

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Heat Transfer- Conduction, Convection, Radiation

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Duration: 4:35
Updated: 19 Apr 2015
views: 11850

This is a commentary which presents how heat is transferred (through conduction, convection, and radiation) and will be useful for educational purposes. We hope this video will increase your knowledge on this topic and we hope you enjoyed! Please feel free to like, ask us a question and of course, don't forget to share with it your friends!

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OCE 3008 Convection Current

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Duration: 6:32
Updated: 13 Apr 2009
views: 49422

This is a lab experiment on convection currents. This lab was assigned by Professor Muza for the OCE 3008 course.

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Convection of heat Experiment - Elementary Science

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Duration: 1:33
Updated: 10 Sep 2012
views: 38596

This is an elementary science video that explains Convection of Heat for Grade 7-8 kids. CONVECTION OF HEAT Take a round-bottomed flask. Put some crystals of Potassium Permanganate in it. Pour water into the flask gently so as not to disturb the crystals much. Heat the flask gently. Water molecules go up from the level of Potassium Permanganate reach the surface of the water and come down touching the sides of the flask. After a few minutes the crystals of Potassium Permanganate dissolve in water making it coloured violet. The water at the bottom gets heated and expands. The density of water becomes less because of this expansion, therefore water becomes light and goes up to the top. At the top the cool water which has more density comes down by the sides of the flask. You can observe that the colored water going up in the middle and coming down along the sides of the flask. Molecules absorb heat go up and the cool molecules come down absorb heat and go up. In this way heat gets transferred from one place to another. This process is called convection of heat. The difference in the densities of different parts of the substance is responsible for the phenomenon of convection of heat.

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Thermal conduction, convection, and radiation

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Duration: 9:10
Updated: 23 Jul 2015
views: 15977

Fire as thermal conduction, convection, and radiation

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Heat Transfer - Conduction and Convection | GCSE Physics | Doodle Science

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Duration: 1:27
Updated: 06 Sep 2013
views: 28515

Thanks for Watching! Like and Subscribe if you enjoyed and learnt something! This is the new Channel just for Doodle Science! Script: Conduction is the transfer of heat between substances that are in direct contact with each other and it mainly happens in solids. The heat is conducted from atom to atom using the kinetic energy of the particles, in other words by vibrating. The better the conductor, the more rapidly heat will transfer. Have you ever noticed that metal benches tend to feel colder than a wooden ones? Believe it or not, they are not colder! They only feel colder because they conduct heat away from your bottom better than wood and you perceive the heat that is leaving your bum as cold. Metals are particularly good at conducting heat because of their free electrons that move about the structure colliding with the positive ions and transferring the kinetic energy to them. Convection happens in gases and liquids. As a gas or a liquid is heated, it warms, expands, and rises because it is less dense. When the gas or liquid cools, it becomes denser and falls. As the gas or liquid warms and rises, or cools and falls, it creates a convection current, which is what transfers the heat from one place to another. For example when you turn on your radiator, despite the name the room is heated by convection, as the air is heated above the radiator, it expands, rises and the cooler, denser air sinks causing a convection current around the room.

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Lecture - 18 Forced Convection - 1

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Duration: 50:41
Updated: 11 Dec 2008
views: 47357

Lecture Series on Heat and Mass Transfer by Prof. S.P.Sukhatme and Prof. U.N.Gaitonde, Department of Mechanical Engineering, IIT Bombay. For more details on NPTEL visit http://nptel.iitm.ac.in

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Convection vs. conventional ovens explained

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Duration: 2:06
Updated: 06 May 2015
views: 23365

Skip the souffles but not the cookies: Sharon Profis shares some tips on what's different about convection ovens. Subscribe to CNET: http://bit.ly/17qqqCs Watch more CNET videos: http://www.cnet.com/video Follow CNET: http://twitter.com/CNET

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Conduction, Convection, and Radiation

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Duration: 12:15
Updated: 02 Oct 2011
views: 97393

This was a video myself and two other teachers created for 8th grade Physical Science. We are all clearly aware of some of the "nuances" that some of you have kindly, and might I add, not so kindly, pointed out. For those of you who are not teachers in primary education settings you must first teach concepts before expanding, elaborating, and teaching exceptions. For 8th grade purposes on the Common Core Standards this video is accurate and I believe extremely helpful for those who may need clarification on this challenging topic for that age group. I would like to ask that people refrain from using any more vulgarity in the comment section.

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Conduction, Convection, and Radiation

Order: Reorder
Duration: 3:54
Updated: 20 Nov 2010
views: 413970

A Rap of Conduction, Convection, and Radiation done for a school project Sources: Idea & Song from: http://www.teachertube.com/viewVideo.php?video_id=159713&title;=Radiation__Conduction_and_Convection http://www.educationalrap.com/song/radiation-conduction-convection.html Lyrics: Chorus There are three ways that heat can travel But it can travel in any direction From the sun it moves to the earth, quick as a shadow And disperses in radiation, conduction, and convection Verse I First things first, let's discuss heat What it is before you pay for it to warm your feet Heat is the energy that flows when atoms and molecules move It diffuses out toward coolness Temperature is the measurement of The average motion of these atoms And molecules in the atmosphere So there have it Now, the first way of transportation of heat energy is radiation Like sound waves from your radio stations Filling the empty space around you Your radiator warms you, but don't start a fire now, I warned you Heat is going through radiation from the sun Before it burns you from 93 million miles away To re-radiate this heat is what the earth does for you This is survival what this heat is going through Before it rises to the sky and it's gone so... Chorus Verse II Conduction is the second method on my list You can feel it like a hot pot on your fist With the handle gripped I bet you'd rather grab a candle lit 'Cause it's heat through conduction that causes this Atoms in matter in a fixed position vibrate when heated Like a pan in the kitchen Transmit the heat energy to atoms next to them That are cooler than they are to cause equilibrium To even out the temperature the heat has to travel Up the spoon in your tea in the morning with your bagel It might burn your hand, but just learn the land of conduction heat energy until you understand The earth gains little from conduction It's mostly radiation that helps us function and keeps us warm It's just another way for heat to move But now let's move on to method three to prove... Chorus Verse III Convection is the movement of heat in liquids and gasses To even out the temperature fastest This process is called diffusion It's a flow of particles cold and hot in a fluid If you're not listening, then stop what you're doing 'Cause this final mode that heat can move in And this affects you everyday It's the breeze at your back and the wind at your face When heat reaches the earth it rises at a rate With the air in the place and it moves up till it cools Trillions of molecules together Make up the weather that we see on the news It's how they measure the pressure of the air and the temperature But convection is how it got there in the atmosphere So don't be scared. Heat moves in three ways So we made things clear, it's like...

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Convection In Water

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Duration: 2:41
Updated: 26 Nov 2010
views: 51438

When the water at the bottom of the flask is heated, it expands. The expanded water is less dense than the surrounding water and therefore starts to rise. In doing so, the cooler regions of the water in the upper part of the flask, being denser, sink. This movement of the liquid due to a difference in its density sets up a convection current. Convection currents occur only in fluids such as liquids and gases but not in solids. This is because convection involves the bulk movement of the fluids which carry thermal energy with them. For solids, the thermal energy is transferred from one particle to another through vibrations, without any bulk movement of the particles themselves.

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Convection - Smoke Flow | English | See Air Flow!

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Duration: 2:09
Updated: 02 Aug 2014
views: 6283

This experiment is a very graphic demonstration of convection currents. You need a big cardboard box, transparency, candle and a few incense sticks. Make two holes in the side of a cardboard box. Cut a large rectangular window in the front and stick a transparency. Stick black paper in the background. This will help you to see the path of smoke. Now roll two transparencies into small chimneys and press fit them in the holes of the box. The front of the box is a transparency and there is black paper in the background. Then light a flat candle and place it inside the box just below the left hand chimney. We know that a burning candle heats the air. And hot air being lighter will float up from the left chimney. As the hot air goes up from the left chimney it will draw in air from the right hand chimney. Now bring two lighted incense sticks near the right chimney. Soon the smoke from the sticks will be drawn in and you will be able to see swirling clouds of smoke going in the box. The smoke makes the air currents visible. The smoke will eventually exit from the left chimney. This work was supported by IUCAA and Tata Trust. This film was made by Ashok Rupner

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