what material reduces the flow of heat?

Question

i need to know it is for a project.
thanx i appreciate all the answers.


thanx!

Answer 1

Insulators do, rock wool is an example.

Answer 2

Anything which is a resistor to heat is a poor conductor. Metals for example are good conductors. Air is a poor conductor. So the material characteristics may be something which has a lot of trapped air, like bubble filled material. But the problem is that you need to define the geometry of the material. What is the shape you need? Unless you can describe some shape you cannot determine exactly what material you can use. Heat transmission, if solely by conduction, is determined by the area which heat must be transferred, the distance it is transferred, and the thermal coefficient of the material. Think of a group of square blocks, and they all have the same cross section. Stack them in a row. If the cross section is one square unit, like one square inch, then the amount of heat that can be transferred is dependent upon the cross section area and the number of blocks you use, the distance. Then that is affected by the material, and that may not be as important as the cross sectional area and distance.

Answer 3

You need a material with lower thermal conductivity. Heat flows in three ways: convection, conduction, and radiation. Look at a thermos bottle, it is evacuated so there is no convection or conduction (except thru the glass wall and glass is not a good conductor of heat) and it is mirrored so that it does not radiate much. For your application, you might have some fiberglass house insulation, even cotton balls will work because these materails trap tiny pockets of air and reduce heat flow.

good luck

Answer 4

An insulator, (low to near zero Thermal Conductivity), depending on the material, may almost completely block the heat path or slow down the heat transfer rate to a minimum. The only thing that blocks Conduction and Convection of heat is a Vacuum. (It won't block Radiated heat).

Answer 5

relative to what?
A vacuum gap with mirrored boundaries is about the best you can get.

A straight air gap is actually pretty good: 0.025 W/m*K, it needs to be at least 13 mm, to balance between conductivity and convection. Put aluminum foil on both sides of the gap to minimize the blackbody emission.

Answer 6

insulators reduce the flow of heat.

air space is a good insulator.(birds fluffing their feathers, cable knit sweaters, waffle kit long underwear, layers of clothing, and even the fiberglass insulation used in attics uses air space)

Answer 7

a (thermal) insulator

the quilt on your bed stops heat loss
a pullover stops heat loss
a vacuum flask (mirrored surfaces and a vacuum) stops heat loss