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conduction

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Conduction

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1. Conduction and convection require a material medium whereas radiation can occur in vacuum also.2. Conduction is a slow process. Convection is faster than conduction. Radiation is the fastest in which heat transfer occurs at the speed of light.3. In conduction, transfer of heat takes place in any dierction; in convection heat transfer occurs only in a vertically upward direction; Radiation of heat from a hot body takes place in all directions along straight lines.4. Conduction and convection processes heat up the medium where as radiation does not heat up the space between the bodies that undergo heat transfer.5. In conduction there is no movement of particles of the medium; in convection there is movement of particles of the medium; in radiation heat is directly transferred from the hot body to the cold body in the form of electromagnetic waves.

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1. Conduction and convection require a material medium whereas radiation can occur in vacuum also.2. Conduction is a slow process. Convection is faster than conduction. Radiation is the fastest in which heat transfer occurs at the speed of light.3. In conduction, transfer of heat takes place in any dierction; in convection heat transfer occurs only in a vertically upward direction; Radiation of heat from a hot body takes place in all directions along straight lines.4. Conduction and convection processes heat up the medium where as radiation does not heat up the space between the bodies that undergo heat transfer.5. In conduction there is no movement of particles of the medium; in convection there is movement of particles of the medium; in radiation heat is directly transferred from the hot body to the cold body in the form of electromagnetic waves.

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heating a tin can of water using a Bunsen burner

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by aarushi,ishgun and aditi

the process by which heat is transfered to the molecules directly in which direct material is not in touch with the object

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daksh

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After a car is turned on, the engine becomes hot. The hood will become warm as heat is conducted from the engine to the hood.
Tanay&Aaryaveer

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http://www.ces.fau.edu/ces/nasa/images/Energy/ConvetionConductionRadiation.jpg

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Conduction is the process of transfer of heat from the hotter part to the colder part of an object without the movement of its particles. Also, in conduction, heat gets transferred between substances that are in direct contact with each other. In solids heat transfer takes place by conduction.

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Conduction is the process of transfer of heat from the hotter part to the colder part of an object without the movement of its particles. Also, in conduction, heat gets transferred between substances that are in direct contact with each other. In solids heat transfer takes place by conduction.

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daksh

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convection is when the heat is passed to the molecules and the molecules and the molecules are gone above the water one by one

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The process in which heat flows from one object to another either through a medium or through vacuum, without heating up the space in between, is called radiation. The heat absorbed from the surroundings by a body increases its temperature. The sun warms  up the earth through radiation. A camp fire, a microwave oven and a light bulb are a few examples of objects that transfer heat by radiation.
daksh

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Convection is the process of transfer of heat through currents

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Radiator - Puts warm air out at the top and draws in cooler air at the bottom.

Steaming cup of hot tea - The steam is showing heat being transfered into the air.

Ice melting - Heat moves to the ice from the air. This causes the melting from a solid to liquid.

Tanay&Aaryaveer

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iron, alumium
amey

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RADIATION :

radiation is the emission or transmission of

energy in the form of

waves or

particles through space or through a material medium.

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Convection is the name for a means of heat transfer, as distinguished from conduction and radiation. It is also a term that describes processes affecting the atmosphere, waters, and solid earth. In the atmosphere, hot air rises on convection currents, circulating and creating clouds and winds.~Aaditya

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Heat can travel shift from one place to another in three manners namely: Conduction, Convection, and Radiation. Conduction and convection need matter to transfer heat.

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Heat can travel shift from one place to another in three manners namely: Conduction, Convection, and Radiation. Conduction and convection need matter to transfer heat.

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daksh

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 radiation is the emission or transmission of energy in the form of waves or particles through space or through a material medium.

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Radiation is energy. It can come from unstable atoms that undergo radioactive decay, or it can be produced by machines. Radiation travels from its source in the form of energy waves or energized particles. There are different forms of radiation and they have different properties and effects.
Link:-https://www.epa.gov/radiation/radiation-basics
Tanay&Aaryaveer

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by ishgun
* materials which allow heat to be conducted through them easily are called good conductors of heat
*for example ; iron, copper, silver, aluminium

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Materials which allow heat to be conducted through them easily are called good conductors of heat.

Materials which do not allow heat to be conducted through them easily are called bad conductors of heat or insulators of heat.

Tanay&Aaryaveer

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there are three types in which the heat can be transfered

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there are three types in which the heat can be transfered

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conduction , convection
and radiation
daksh

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Radiation is the flow of heat through vaccum and are called radiant energy. They may be transferred through UV rays or INFRARED rays

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A vacuum flask, or thermos, does not allow heat transfer by any of the three ways that heat can travel. The silver coating on the inner bottle prevents heat transfer by radiation, and the vacuum between its double wall prevents heat moving by convection. ... The case surrounding the flask provides additional insulation.

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Heat conduction takes place between two objects in contact with each other. Heat energy moves from one material to the other. In heat conduction, the heat energy travels from the hot point to a cold point. Eventually, the two materials will even out in temperature as the heat keeps on transferring until the temperatures are the same. This is equilibrium. For example, a pan of hot soup is taken off the oven and put on a table. The area of the table under the pot gets hot. Heat from the pot moved to the table top by conduction.

Electrical conduction is usually done through wires or cables. Something that electrons can easily move through is a good electrical conductor. Metals are mostly good conductors. An insulator like rubber is a poor conductor. Plastics are insulators. Some materials, such as glass, are conductors for heat but not electricity.

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thermos flask - ayush abhinav

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RADIATION :

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Convection is the name for a means of heat transfer, as distinguished from conduction and radiation. It is also a term that describes processes affecting the atmosphere, waters, and solid earth. In the atmosphere, hot air rises on convection currents, circulating and creating clouds and winds.~aaditya

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A BLACK OBJECT ABSORBS MORE RADIANT HEAT THEN A WHITE OBJECT IN THE SAME TIME PERIOD

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* materials which do not allow heat to be conducted easily through them are called insulators
*examples - wood , plastic and glass

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Convection is the name for a means of heat transfer, as distinguished from conduction and radiation. It is also a term that describes processes affecting the atmosphere, waters, and solid earth. In the atmosphere, hot air rises on convection currents, circulating and creating clouds and winds.

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Convection is the name for a means of heat transfer, as distinguished from conduction and radiation. It is also a term that describes processes affecting the atmosphere, waters, and solid earth. In the atmosphere, hot air rises on convection currents, circulating and creating clouds and winds.

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There is a certain species of fungus in Chernobyl that actually thrives on radiation (Crytococcus neoformans)

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https://www.polartrec.com/files/resize/members/brandon-gillette/images/mechanismsheattransfer-500x360.jpg
sahil

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RADIATION:

Both conduction and convection require matter to transfer heat. Radiation is a method of heat transfer that does not rely upon any contact between the heat source and the heated object. For example, we feel heat from the sun even though we are not touching it. Heat can be transmitted though empty space by thermal radiation. Thermal radiation (often called infrared radiation) is a type electromagnetic radiation (or light). Radiation is a form of energy transport consisting of electromagnetic waves traveling at the speed of light. No mass is exchanged and no medium is required.

Objects emit radiation when high energy electrons in a higher atomic level fall down to lower energy levels. The energy lost is emitted as light or electromagnetic radiation. Energy that is absorbed by an atom causes its electrons to "jump" up to higher energy levels. All objects absorb and emit radiation. ( Here is a java applet showing how an atom absorbs and emits radiation) When the absorption of energy balances the emission of energy, the temperature of an object stays constant. If the absorption of energy is greater than the emission of energy, the temperature of an object rises. If the absorption of energy is less than the emission of energy, the temperature of an object falls.

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https://www.youtube.com/watch?v=Xei0d47gwoY
Tanay&Aaryaveer

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daksh

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Chemistry Heat Part 11 (Analogy of conduction, convection, radiation) Class 7 VII

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SEA AND LAND BREEZES ARE ACTUALLY CONVECTION CURRENTS

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CONVECTION:In liquids and gases, convection is usually the most efficient way to transfer heat. Convection occurs when warmer areas of a liquid or gas rise to cooler areas in the liquid or gas. As this happens, cooler liquid or gas takes the place of the warmer areas which have risen higher. This cycle results in a continous circulation pattern and heat is transfered to cooler areas. You see convection when you boil water in a pan. The bubbles of water that rise are the hotter parts of the water rising to the cooler area of water at the top of the pan. You have probably heard the expression "Hot air rises and cool air falls to take its place" - this is a description of convection in our atmosphere. Heat energy is transfered by the circulation of the air.

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Chemistry Heat Part 11 (Analogy of conduction, convection, radiation) Class 7 VII

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As water is a bad conductor of heat the ice ddoes not melt

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Good conductors are materials that can conduct electricity and heat efficiently. Most good conductors are metals but carbon (a non-metal element) also conducts electricity (pencil lead electrical switch experiment). Examples of good conductors are iron rods and copper wires.
daksh

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https://www.youtube.com/watch?v=B8H06ZA2xmo
Tanay&Aaryaveer

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CONDUCTION
I have 4 markers in my hand and

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reaction

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The above diagram shows convection current when a liquid is boiled

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Dark coloured objects absorb and radiate more radiant heat than light coloured objects.
Tanay&Aaryaveer

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HEAT TRANSFER CONDUCTION CONVECTION RADIATION - AYUSH ABHINAV

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HEAT TRANSFER CONDUCTION CONVECTION RADIATION - AYUSH ABHINAV

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Heat Transfer- Conduction, Convection, and Radiation

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https://youtu.be/Atnjo7dD_bA

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https://youtu.be/2BMRx45Nt5I
sahil

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The thermos flask minimizes transfer of heat by conduction, convection or radiation.
Tanay

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Tanay

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Science - How heat transfers Processes and How Radiation process works – English

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Conductors are materials that allow free flow of electrons from one particle to another. These are elements which have electric charges in the form of electrons that are comparatively free to move inside the material. When charge is transferred to such an element, it gets distributed across the entire surface of the object, which results in the movement of electrons in the object

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insulator
insulators are materials that hinder the free flow of electrons from one particle of the element to another. If we transfer some amount of charge to such an element at any point, the charge remains at the initial location and does not get distributed across the surface. The common process of charging of such elements includes charging by rubbing (for some elements, with the help of suitable materials) and charging by induction. Plastic, wood, glass, etc. are common examples of insulators.

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conductor and insulator

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What is Heat | Examples of Heat Energy | Conductors and Insulators | Heat and Temperature

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What is Heat heat definition. In physics, a form of energy associated with the movement of atoms and molecules in any material. The higher the temperature of a material, the faster the atoms are moving, and hence the greater the amount of energy present as heat. (See infrared radiation.)