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Answered 2008-05-13 20:27:00

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Which type of material allow the transfer of heat by convection?

liquids


What is the material that does not allow energy to pass through it easily?

Materials that allow energy to flow easily through it are called conductors.


Which life process uses food to transfer energy to allow movement?

Respiration


How many valence electrons does an insulator have?

It is not the number of valence electrons that an insulator has that is important. It is the way the valence electrons are "arranged" in the structure of the material that matters. If not all the valence electrons of a substance are "involved" in the structure of the material, then these electrons are said to be free electrons. They move about in the substance, and are free to contribute to electron flow. The metals are examples. In contrast with this, if all the electrons are bound up in a material, they are not free to support current flow, and the material is said to be an insulator. Said another way, if the valence electrons in a material are in a Fermi energy level that overlaps the conduction band for that material, the material is a conductor. In an insulator, the valence electrons are all in Fermi energy levels that are below the conduction band for that material, and it is an insulator. Applying a voltage to an insulator will not "lift" the valence electrons up into the conduction band to allow them to support current flow.


How does energy transfer affect the particles of matter?

energy transfer allows things to heat each other and to allow motion because if particles did not interact with each other (energy transfer) each atom would be able to pass through other atoms


What type of materials work in conduction?

Conductors allow heat to pass. And carries the process of conduction.


Does aluminum conduct cold faster than glass?

Aluminum is a conductor and glass is an insulator. Conductors allow the flow of energy transfer, but insulators block this transfer of energy. So by definition, Yes, aluminum conducts cold or heat(energy) transfer faster than glass.


What is a property of air related to heat making it useful in insulating?

Air is a mixture of gasses. In a gas, the molecules are far apart, so they do not allow for the easy transfer of heat by conduction.


What is a material that does not allow energy to flow?

an insulator. such as: rubber, wool, paper, glass, yarn and so on.


Why is a transfer useful in an amplifier?

Transfer means to allow through (science-transmit e.g a window and light energy. the light energy is transmitted through) and so if the energy wasnt allowed through there wouldnt be a current or circuit because the energy would be lost i the amplifier


Why are solids better heat conductors than liquids?

Solids have a denser atomic structure and allow easer transfer of energy (heat is energy) to lower energy structures nearby.


How is heat transferred in solids liquids and gases?

Hey here's some answers: CONDUCTION Thermal energy can move through a substance by conduction. * Substances that allow thermal energy to move easily through them are called conductors. Metals are good conductors of thermal energy. * Substances that do not allow thermal energy to move through them easily are called insulators. Air and plastics are insulators. When a substance is heated, its particles gain energy and vibrate more vigorously. The particles bump into nearby particles and make them vibrate more. This passes the thermal energy through the substance by conduction, from the hot end to the cold end. This is why the handle of a metal spoon soon gets hot, as well as its rounded part, when the spoon is put into a hot drink. CONVECTION The particles in liquids and gases can move from place to place. Convection happens when particles with a lot of thermal energy in a liquid or gas move, and take the place of particles with less thermal energy. Thermal energy is transferred from hot places to cold places by convection. RADIATION All objects transfer thermal energy by radiation called infrared radiation. The hotter an object is, the more radiation it gives off. No particles are involved in radiation, unlike conduction and convection. This means that thermal energy transfer by radiation can even work in space, but conduction and convection cannot. Radiation is why we can feel the heat of the Sun, even though it is millions of kilometres away in space. The police use infrared cameras to track down criminals in the dark. hope this helps!


What method of heat transfer is occurring between the liquid and the metal spoon?

Heat (thermal energy) will move between a liquid and a spoon placed in it by the method we call conduction. The thermal energy will be conducted from a hot liquid to a cool spoon by direct contact. There will be a bit of convection in the liquid near the spoon. This is because that liquid (being hotter or cooler than the spoon, depending on the experiment) changes density and either rises or descends. But the point is that direct contact between the liquid and the spoon will set up conditions that allow conduction of the thermal energy.


Is a vacuum a good conductor of heat?

Heat is the transfer of energy from one object or substance to another. There are three types of heat transfer - conduction, convection, and radiation. Conduction requires that the first object (or substance) be in direct physical contact with the second. A vacuum between the substances prevents this type of heat transfer, which is why double-paned windows are evacuated between the panes to reduce heat transfer to the outside. Convection occurs when atoms or molecules move in fluids (gases or liquids), and carry the kinetic energy of molecular motion with them. Since a vacuum doesn't contain any atoms or molecules, convection will not occur in a vacuum. Technically, a vacuum would allow atoms and molecules to convect through it, but then it wouldn't be a full vacuum. Radiation is energy transfer by electromagnetic waves (light). Light does not require a medium to propagate and will travel perfectly well through a vacuum, which is how the energy of the Sun is transferred to the Earth. So heat can be transferred through a vacuum by radiation.


Does conduction allow oceanic crust to sink back into the mantle?

No, subduction does.


What name is property metals that allow electricity to pass through?

conduction.


Does an object transfer all its energy to another object?

yes, it transfers by conductor [substance that doesn't allow electricity flow through it].


What is the definition of conductors and insulators?

A conductor is a material that can transfer energy efficiently and and insulator is the opposite.Conductor means something that blocks it and insulator means something that can go through itA conductor easily transfers energy in the form of electricity and/or heat, while an insulator does not easily transfer these types of energy.In electricity, a conductor is a material that can let current pass through and an insulator does not let current pass through,or rather copper is a conductor and plastic is an insulator.A insulator is something that will not allowheat/electricity to pass through it and a conductor is something that allows heat/electricity to pass through it.


How is heat transfer from one object from another?

Heat can be transferred from one place/object to another by three methods: conduction in solids, convection of fluids (liquids or gases), and radiation through anything that will allow radiation to pass.


Why does heat energy from the sun reaches the earth only by radiation?

Simply put, there are 3 heat transmission phenomenons : convection, conduction and radiation. The first two are highly dependent of the nature of the material inbetween the two objects, which in this case is nothing at all. Waves, however, travel accross space and allow heat transmission by radiation.


How can heat transfer be promoted?

Answer is within heat transfer equationconduction = (k.A.dT/x)dtConvection = (h.A.dT)dtRadiation = s.e.AdT4.dtIncrease of conductivity (k) or heat transfer coefficient (h) or area (A) or temperature difference (dT) or contact time (t) or emissivity (e) allow for higher amount of energy to transfer.Reduce of transfer distance (x) increase rate of energy transfer.Increase flow rate to boost convection heat transfer (fluid)Increase surface area of contact (solid - fluid)Design heat exchanger in counter current flow (fluid)Prolong retention time (higher contact time -> more heat can transfer)Change of heat transfer medium (better thermal conductor medium)Use of heat pump (promote higher temperature difference yield better heat transfer)Coat surface with black colour (higher emissivity promote radiation heat transfer)


What is impermeable material?

Impermeable material is material that does not allow anything to penetrate it. An example of it is CLAY.


Why are engines such as the st205 important to have in cars?

Combustion engines allow a car to transfer potential energy stored in gasoline into mechanical energy that powers the pistons to turn a cars' wheels. Simply put, engines, such as the high performance st205 used by Toyota, allow cars to move.


Function of gap junction?

Allow for conduction of action potentials.Example: On walls of intestine, gap junctions allow the cells to contract as a single unit.


What is a material that doesn't allow charges to move through it easily?

Wood An insulator is a material that does not allow charges to move through it easily.


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