What common material would be the best insulator for thermal conductivity?
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Asked in Science
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.
Asked in Bridges and Tunnels
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. This detector senses The thermal conductivity detector (TCD) is a bulk property detector and a chemical specific detector commonly used in gas-liquid chromatography. 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.
Asked in Science, Home Electricity
What material is the best conductor of heat?
metal copper are the best conductor of heat Answer 2 The metal with the best thermal conductivity is silver, but copper is the common metal that would be used for it is much cheaper. I believe that diamond has an even higher thermal conductivity, and for this reason is used as a thin film in semiconductor operations. But I haven't the data to hand.
Asked in Energy
What is the rate at which a substance transfers thermal energy?
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.
Asked in Physics
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?
Asked in Physics, Chemistry, Comparisons, Metal and Alloys
Why are alloys better than pure metals?
Asked in Science
What do thermal conductors and thermal insulators have in common?
Which metal conduct heat best?
Asked in Science
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).
Asked in Home Electricity
Why is plastic a good electrical insulator?
Asked in Chemistry, Chromatography
Does analysing a specific gas by gas chromatography destroy the gas as in turn it into something else or some other gas?
What do conductivity and reactivity have in common?
Asked in Science
What is thermopore?
Thermopore is the registered brand name of Industrial Enterprises (Pvt.) Limited for Expanded Polystyrene (EPS) in Pakistan. The name has become so common that EPS is now commonly referred to as Thermopore throughout the country. EPS material is used to make insulation sheets, packing material, void fills and mouldings. Its very low thermal conductivity, light weight yet high compressive strength makes it suitable for these uses. Also the fact that it can be moulded into many shapes and sizes makes it a very popular material for packing purposes