0
What common material would be the best insulator for thermal conductivity?
Wiki User
∙ 6y agoWant this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
What are 3 common insulators?
Styrofoam is the most common thermal conductivity of 0.001 Js^-1K^-1 Down thermal conductivity of 0.025 Js^-1K^-1 Wool thermal conductivity of 0.04 Js^-1K^-1
An example of a insulator?
An insulator has several different meanings. The two most common are an electrical insulator and a thermal insulator. an electrical insulator would be polyethylene. a thermal insulator would be wool.
What functions as a heat insulator?
Many materials, styrofoam is a common one. Even air can be used to insulate heat. All materials have a thermal conductivity, in the unit Watts/meter*Kelvin. The lower the number, the less heat it transfers. So technically any material is an insulator, there are just very good ones and very poor ones.
What is conductivity bridge?
The thermal conductivity detector (TCD) is a bulk property detector and a chemical specific detector commonly used in gas-liquid chromatography. [1]This detector senses The thermal conductivity detector (TCD) is a bulk property detector and a chemical specific detector commonly used in gas-liquid chromatography. [1]This detector senses changes in the thermal conductivity of the column effluent and compares it to a reference flow of carrier gas. Since most compounds have a thermal conductivity much less than that of the common carrier gases of helium or hydrogen, when an analyte elutes from the column, the effluent thermal conductivity is reduced and produces a detectable signal. changes in the thermal conductivity of the column effluent and compares it to a reference flow of carrier gas. Since most compounds have a thermal conductivity much less than that of the common carrier gases of helium or hydrogen, when an analyte elutes from the column, the effluent thermal conductivity is reduced and produces a detectable signal.
What makes a good insulator of heat?
The most common usage of (thermal) insulation of heat are Ceramics.
The rate at which a substance conducts heat?
Thermal energy flows through any material where there are regions of different temperature. Obviously, heat flows from hot to cold. The rate at which heat flows through a material is determined by the thermal conductivity of the material. All types of matter have some thermal conductivity. (Thermal resistivity is a related concept but is basically the inverse of thermal conductivity.) Thermal conductivity is a materials specific property. There are tables of values available for all common substances. For all solids, the rate of heat flow is directly proportional to temperature difference. In a simple geometry, such as a flat plate with two surfaces at different temperatures, there is a simple formula to give the rate of heat flow from the hot surface to the cold one. For fluids and gasses, the rate which thermal energy is transferred become complex because of convection processes where movement of the the liquid or gas itself occurs. This is a very geometry specific situation and there is no simple formula for calculating heat transfer rates. (People have developed useful formulas for some special cases and these are applied as needed in engineering.) Though not immediately relevant, energy transfer can occur through radiative processes. It is necessary to mention that for completeness. The basic answer is that a substance transfers thermal energy at a rate determined by its thermal conductivity.
A material that reduces the flow of heat by conduction convection and radiation?
We call material that acts in that way a thermal insulator. Sometimes we shorten it to just insulation, but we need to be clear that we're talking about thermal energy and not, say, electrical energy.
What type of materials make a good insulators?
That rather depends on what you wish to insulate from.For electricity, materials of low electrical conductivity, such as porcelain, and many plastics, are useful. Particularly if designed to have suitable environmental properties, such as corrosion resistance, heat resistance and so on.For a magnetic field, then there are specially designed metal sheets, (mu-metal) that may be used to shield a part from magnetic fields.For thermal isolation, it is hard to past a vacuum, for it has low conductivity. This is the basis of your thermos flask. In applications such as the walls of refrigeration containers, or houses, then one usually goes for a low-mass material of low (thermal) conductivity. Air is a common insulator, and may be entrained against conduction and convection by the use of closely packed fine fibres such as wool or fibreglass, or the closed-cell foam materials.For Acoustic insulation, then we choose to have a material whose mass and resilience are as far as possible from those of air. Dense massive materials, such as concrete, or gypsum wallboards are very effective. It is vital that there are no penetrations or air passages through a sound insulator, for these would bypass the insulator. For sound waves are carried as vibrations through the air.
Anyone knows which common material is a best insulator of heat?
That will depend on the application. For example, what may be a suitable insulator on a coal fired blast furnace may not be suitable as a lining in a winter jacket for children.
What are some examples of properties in elements?
Examples: atomic number, number of isotopes, atomic weight, density, position in the periodic table, hardness, electrical conductivity, thermal conductivity, color, odor, crystallographic system etc.
How good insulator?
There are several types of insulators: thermal, electric,, sound insulators and other. I assume you are talking about electrical insulators. The electrical resistance per unit area of a wire and unit length is called specific resistance or resistivity r and it is obtained by the wire resistance R as r=R A / L where A is the wire area and L is the wire length. It is the resistivity that qualify a material as a good electrical insulator. Perhaps the best insulator among common materials is fused quartz whose resistivity is about 1016 Ohm m (that is one with 16 zeros after it !!). Also glass is a very good insulator, pure glass (that is pure amorphous SiO2 without any metal addition) has a resistivity of about 1014 Ohm m. Just for an additional reference, gold that is a very good electrical conductor has a resistivity of 2.35 10-8 Ohm m, that is 0,00000000235 !) It is to be observed that, due to the mechanism underlying electrical and thermal conductivity, solid materials that are good electrical insulators are generally also good thermal insulators (but few exceptions do exist).
Why is COPPER often used in antenna's?
Copper is a metal with high conductivity which is essential for a par signal. Its also a fairly common material that is easily formed
