which one of the following statements best explains why convection does not occur in solids?


Which One Of The Following Statements Best Explains Why Convection Does Not Occur In Solids??

Which one of the following statements best explains why convection does not occur in solids? Molecules in a solid are more closely spaced than in a gas. The molecules in a solid are not free to move throughout the volume of the solid.Dec 23, 2020

Why would convection not occur in a solid?

Convection of mass cannot take place in solids, since neither bulk current flows nor significant diffusion can occur in solids. Instead heat diffusion in solids is called heat conduction, which we’ve just reviewed.

Why does convection only occur in liquids and gases and not solids?

Convection only occurs in fluids (liquids and gases). When we heat a liquid in flask, the particles of the liquid at the bottom get heated, become lighter and actually rise up. … Convection can not happens in the solid, since the atom in the solid are not able to move around and bulk current does not flow.

Does convection occur only in solids?

Convection only happens with fluids, materials that can flow. … Solids are stuck in place so they can’t flow and since they can’t flow, there is no convection. The way heat transfers through solids is conduction.

Why is conduction not possible in solids?

Conduction can takes place in Solids,liquids and gases. But it is maximum in solids as their atoms and molecules are located closer. Metals are the best solids to conduct the heat as they have tightly packed atoms which can pass the kinetic energy and the free electrons to the near by atoms and leads to conduction.

Why does convection not occur easily in solids Class 7?

In the process of convection, molecules move from a hotter place to a colder region. Therefore, convection is impossible in solids because the molecules are rigid and vibrate when heated. In liquids and gases, molecules are comparatively less rigid and can move easily, thereby making convection possible in them.

In which of the following convection does not occur?

In convection process heat is transferred by the bodily motion of the heated particles. It is not so in case of warming of glass bulb due to filament heating.

Why does convection occur in heated liquids?

Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy. … Liquids and gases expand when they are heated. This is because the particles in liquids and gases move faster when they are heated than they do when they are cold.

What causes convection?

Convection currents are the result of differential heating. Lighter (less dense), warm material rises while heavier (more dense) cool material sinks. It is this movement that creates circulation patterns known as convection currents in the atmosphere, in water, and in the mantle of Earth.

Why convection does not occur in solids and in vacuum?

Answer:Convection is heat transfer by mass motion of a fluid such as air or water. Convection does not occur in solids because the particles within are too tightly packed to facilitate the process. …

What does not occur in solids?

Convection not possible in solids because the particles within are too tightly packed to facilitate the process. Convection requires actual movement between the particles within a substance in order to transfer heat which is only possible in a fluid state of matter such as liquid or gas.

Does conduction occur in solids?

Conduction is the process by which heat energy is transmitted through collisions between neighboring atoms or molecules. Conduction occurs more readily in solids and liquids, where the particles are closer to together, than in gases, where particles are further apart.

What is convection class 7th?

Convection: The process of heat transfer from one part of a fluid to another part by the actual movement of the particles of the fluid is called convection. Liquid and gases are heated by the process of convection. … For example, the heat from the sun reaches the earth through radiation mode.

Why is heat transfer by convection possible in liquids and gases Class 7?

The concept of heat transfer by convection embraces the process of transfer of heat from a liquid or gas to a solid through direct contact. … Convection therefore is possible only in liquids and gases because their particles can be easily displaced.

Why can the sun’s heat not reach the earth by conduction or convection Class 7?

Heat can’t be transferred from sun to earth by conduction, because air is a bad conductor of heat. Convection is the transfer of heat in gases & liquids. Convection occurs when a heated fluid moves away from the source of heat and comes in contact with other substances, transferring some of their energy.

In which of the following heat loss is primarily not due to convection?

The transfer of heat from the filament of the bulb takes place through radiation and not convection. Boiling of water takes place through convection when the bottom layer of water receiving direct heat moves above and is replaced by the colder surface water.

Which of the given phenomenon is not related to convection?

Formation of trade winds, land and sea breezes are phenomena related to convection whereas phenomenon in which metallic handle becomes colder than the wooden door is an example of conduction of heat.

Which of the following process involve convection?

Answer:A convection current is a process that involves the movement of energy from one place to another. It is also called convection heat transfer.

How does conduction occur in solids?

Conduction in solids

The atoms are fixed in place but are free to vibrate. When part of a solid absorbs heat energy the atoms vibrate faster and with bigger amplitude. These vibrations pass from atom to atom transferring heat energy as they do so. This process happens in all solids when heated but is a slow process.

Where does convection occur?

Convection currents in the Earth occur in the mantle. The core of the Earth is extremely hot, and material in the mantle close to the core is heated…

How does convection take place in fluid like water inside the pan?

Heat transfer in fluids generally takes place via convection. Convection currents are set up in the fluid because the hotter part of the fluid is not as dense as the cooler part, so there is an upward buoyant force on the hotter fluid, making it rise while the cooler, denser, fluid sinks.

Which of the following is not a method of transfer?

Explanation: also convection is only posible in fluid where the particles can move easily and the rate of convective heat transfer depends on the rate of flow to a great extend . in solids the particles can rigid and cannot move So, heat is not transferred by the process of convection solids.

What are the three main sources of convection?

Types of Convection
  • Natural convection.
  • Forced convection.

What are two factors that cause convection?

What are two factors that cause convection?
  • heating and cooling of the fluid,
  • changes in the fluid’s density, and.
  • force of gravity.
  • The heat source for these currents is heat from Earth’s core and from the mantle itself.
  • Hot columns of mantle material rise slowly.

Is convection possible in vacuum?

Convection. Convection is the transfer of heat through the flow of fluids. Both liquids and gases can convect heat. … But because space is a vacuum, there are no liquids or gases to convect heat away from the sun, all the way to Earth.

Can radiation occur in a vacuum?

Heat typically travels through three main pathways: conduction, convection and radiation. … But radiation — heat transfer via electromagnetic waves — can occur across a vacuum, as in the sun warming the Earth.

Which one is not an example of convection?

Boiling of an egg is not an example of convection. It is an example of conduction.

Can the transfer of heat by convection occur in solids Why?

Heat transfer of convection does not take place in the case of solids because , in liquids, when the molecules are heated they rise up and come to the top. … That is why in solids the transfer of heat takes place through conduction in which the heat is travelling from one molecule to the others by passing on the heat.

Is convection heat transferred?

Convection. Convective heat transfer is the transfer of heat between two bodies by currents of moving gas or fluid. In free convection, air or water moves away from the heated body as the warm air or water rises and is replaced by a cooler parcel of air or water.

Why is convection faster than conduction?

Whereas conduction is a static process, convection is a more efficient method of heat transfer because it adds the element of motion. A convection oven heats food faster than an ordinary one because it has a fan that blows the hot air around.

What is convection Class 9?

A convection current is a process that involves the movement of energy from one place to another. … Convection is one among the forms of heat transfers, of which the other two are radiation and conduction. Convection process only happens in the fluids i.e. in liquids and gases.

What is convection explain?

convection, process by which heat is transferred by movement of a heated fluid such as air or water. … Forced convection involves the transport of fluid by methods other than that resulting from variation of density with temperature. Movement of air by a fan or of water by a pump are examples of forced convection.

What is convection short answer?

Definition of convection

1 : the action or process of conveying. 2a : movement in a gas or liquid in which the warmer parts move up and the cooler parts move down convection currents.

What is meant by convection in heat transfer?

Heat convection is a mode of heat transfer by the mass motion of a fluid such as air. Heat convection occurs to the surface of an object where the surrounding fluid of object is heated and moved energy away from the source of heat.

YouTube’s best convection currents video! Science demonstration for your students

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Physics – Energy – Heat Transfer – Convection

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