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A thermal isolator.

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โˆ™ 2007-09-10 03:57:05
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Q: A material that reduces the flow of heat by conduction convection and radiation is?
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A material that reduces the flow of heat by conduction convection and radiation?

An insulator


Does loft insulation reduce heat loss by conduction convection or radiation?

Insulation reduces heat loss by replacing air space with a less conductive material (insulation). Therefore the answer is conduction.


Why thermos flask does not let the heat escape?

It is especially designed to reduce heat transfer through conduction, convection, and radiation. A vacuum between two layers reduces the heat transfer through conduction and convection; the fact that the surfaces are mirror-coated also reduces losses through radiation.


Why you create vacuum in thermos flask?

This reduces heat transport through conduction and convection.


How does a vacuum bottle keep food hot or cold?

The main idea is to reduce the heat transfer out of the vacuum bottle, or into it. A vacuum greatly reduces the transfer of heat by conduction and convection, while the mirror reduces heat transfer by radiation.


How does a thermos flask reduce heat loss by convection?

A vacuum between two glass sheets will greatly reduce heat loss through convection, and also through conduction. The fact that the glass is coated (to convert it to a mirror) also reduces the loss by radiation.


What is aconvection current?

A convection current is a natural flow or circulation of fluid due to a variation in its density due to temperature differences. As a fluid's temperature increases, its density reduces, and the fluid rises to be replaced by fluid at a lower temperature. Convection, together with conduction and radiation, is a method of heat transfer.


Which form of heat transfer is reduced by the use of vacuum inside a vacuum flask?

The vacuum reduces both conduction and convection.


Why does fleece keep you warm?

a fleece traps a layer of air which is a insulator of heat. it reduces heat loss via conduction and convection.


What do you call a material that reduces the flow of heat by conductionconvection and radiation?

a thermal isolator


How cavity wall insulation helps to reduce heat loss?

A major part of the heat transfer through a cavity wall lacking insulation is convection - and to a lesser degree radiation. When insulation is placed in the cavity between the walls it significantly reduces both convection (air doesn't move well through insulation like it does in empty space) and radition (the walls can't "see" each other through the insulation). For the insulation to be effective, the thermal conductivity of the material must be low enough that conduction through the insulation is much less than was present with convection.


How does a vacuum in a thermos work and what does it do?

It is used as a vacuum to insulate the inside from the outside. The vacuum reduces the different ways heat can be dissipated; mainly conduction and convection. Very importantly, a Thermos bottle, scientifically called a "Dewar's flask," incorporates a radiant barrier that directs radiant heat back into the hot liquid in the bottle. You can usually see the radiant barrier when the flask incorporates a glass liner, the barrier is the shiny material across the vacuum from the glass. The three ways heat can move are conduction, (through a solid), convection, (through a gas or liquid), and radiation, (through a gas or vacuum). The Dewar's flask addresses all three of the means of heat transfer, that is why it is so efficient.


How does a thermos bottle work?

It uses as vacuum to insulate the inside from the outside. The vacuum reduces the different ways heat can be dissipated; mainly conduction and convection. Very importantly, a Thermos bottle, scientifically called a "Dewar's flask," incorporates a radiant barrier that directs radiant heat back into the hot liquid in the bottle. You can usually see the radiant barrier when the flask incorporates a glass liner, the barrier is the shiny material across the vacuum from the glass. The three ways heat can move are conduction, (through a solid), convection, (through a gas or liquid), and radiation, (through a gas or vacuum). The Dewar's flask addresses all three of the means of heat transfer, that is why it is so efficient. that is true trust me


What radiation results in the greatest change in atomic mass number?

Alpha radiation reduces it by 4.


Is putting a lid on a cup when you want to keep the drink hot a good idea?

Yes, it is a good idea because it reduces conduction and radiation, both process of heat transfer which cause the heat to leave the fluid in your cup and be transferred to the surrounding air.


What is a material that reduces or prevents the transfer of energy?

"insulator"


What is a material like grease which reduces friction?

Graphite


How does a thermos reduce heat transfer using convection?

A thermos reduces does not reduce heat transfer using convection, it reduces heat transfer BY convection. This is because there is a vacuum between the container of the liquid and the outer shell off the thermos. This means that no fluid will go round the inside conducting heat one way or the other. Hope this helped


What do we call a material that reduces the flow of heat?

That would be - an insulator.


How does the ozone layer change the amount of incoming solar radiation?

The ozone layer reduces incoming solar radiation by absorbing ultraviolet light.


What material when placed between a magnet and iron best reduces the attraction?

Any material that does not have magnetic domains.


The white material that reduces friction at the ends of bones is called?

Cartilage


How long do you cook chicken legs in a convection oven?

You should cook chicken legs in an convection oven for between 20 and 30 minutes depending on the temperature. The air movement of convection ovens greatly reduces cooking times when compared to traditional ovens.


How does a cooler keep drinks cold on a hot?

It uses insulation which reduces the amount of heat entering the container by reducing the effects of conduction.


What is the difference between the transfer of heat bt radiation and the transfer of heat by conduction?

Thermal energy that the Earth receives from the Sun travels through space viaelectromagnetic radiation radiated from the Sun's photosphere who's effectivetemperature is about 5 800 K. Thermal radiation is the one that lies between the wavelength of 0.1µ and 100µ of the electromagnetic radiation spectrum and includes visible light (0.38µ - 0.76µ). It can travel in vacuum, and of course, at the speed of light in vacuum (c ≈ 300 000 km/s).The main mechanism of heat transfer within an opaque (not just to visible light butto the rest of the thermal spectrum) solid is conduction. Thermal energy of a body is the sum of its molecules or atoms energies, like their translation energy energy (kinetic energy), rotation energy, vibration energy, electronic energy, ... Inthe case of solids, the main component is molecular vibrations. When a solid bodyis heated on some part of its surface, the molecules increase their vibrationenergy, local temperature goes up. The more excited molecules (or atoms) passtheir energy to their neighboring less excited molecules (it could be said that by'direct contact'). In that manner a cascade of energy is formed from the higher temperature region to the lower temperature region of the body. This heat transfer mechanism is called conduction. Conduction also occurs in liquids and gases. In gases this transfer occurs when molecules or atoms collide, that's why gases are not very good conductors of heat.Heat transfer by convection can take place in liquids and gases. The transport ofheat is done by bulk motion of the fluid. There are two forms of convection:Natural Convection and Forced Convection.An example: Thermal radiation from the Sun first has to cross the Earth'satmosphere before reaching its surface. In its way through the differentatmosphere layers part of the thermal radiation is reflected out, absorbed orrefracted. Absorbed thermal radiation heats some layers more some less of theatmosphere. About 80% of the thermal radiation makes it to the Earth's surface,and heats up the ground. In the interface ground-air air molecules that collidewith the solid ground get heated by 'conduction'. As air is heated it expands (itsdensity reduces) and buoyancy forces make warmed air to rise. This bulk motionproduced by the existence of a difference in temperature (higher temperature of the air close to the ground and lower temperature in the air above), that originatesa difference in density in the fluid is referred as 'natural convection'.In the house on a warm day, when some body turns on an air ventilator to refreshpeople, the motion of the air (convection) is now called 'forced convection', andincreases heat transfer by speeding up the replacement of the warm air film around our body by the cooler air further from the body.