0
Do nonmetals or metals have high thermal and electrical conductivity?
Wiki User
∙ 8y ago
Both thermal conductivity and electrical conductivity tend to be higher in metals than in most other materials.
Wiki User
∙ 8y ago
Wiki User
∙ 8y agoUsually, METALS
Add your answer:
Earn +20 pts
What Is a material that allows heat to flow through it easily?
Thermal conductors let heat move through them. Metals are part of this group.
What has the highest thermal conductivity?
Diamond is the best thermal conductor around room temperature. Diamond has a thermal conductivity of more than 2,000 watts per meter per Kelvin, which is five times higher than the best metals such as copper.
Difference between electrical conductors and electrical insulators?
QuestionIs there a relationship between electrical conductivity and thermal conductivity?Asked by: Darell HayesAnswerThere is a relationship for metals and it is known as the Wiedemann-Franz law. Metals are good electrical conductors because there are lots of free charges in them. The free charges are usually negative electrons, but in some metals, e.g., tungsten, they are positive 'holes.' For purposes of discussion, let's assume we have free electron charges.When a voltage difference exists between two points in a metal, it creates an electric field which causes the electrons to move, i.e., it causes a current. Of course, the electrons bump into some of the stationary atoms (actually, 'ion cores') of the metal and this frictional 'resistance' tends to slow them down. The resistance depends on the specific type of metal we're dealing with. E.g., the friction in silver is much less than it is in iron. The greater the distance an electron can travel without bumping into an ion core, the smaller is the resistance, i.e., the greater is the electrical conductivity. The average distance an electron can travel without colliding is called the 'mean free path.' But there's another factor at work too. The electrons which are free to respond to the electric field have a thermal speed a sizable percentage of the speed of light, but since they travel randomly with this high speed, they go nowhere on average, i.e., this thermal speed itself doesn't create any current.The thermal conductivity of this metal is, like electrical conductivity, determined largely by the free electrons. Suppose now that the metal has different temperatures at its ends. The electrons are moving slightly faster at the hot end and slower at the cool end. The faster electrons transmit energy to the cooler, slower ones by colliding with them, and just as for electrical conductivity, the longer the mean free path, the faster the energy can be transmitted, i.e., the greater the thermal conductivity. But the rate is also determined by the very high thermal speed-the higher the speed, the more rapidly does heat energy flow(i.e., the more rapidly collisions occur). In fact, the thermal conductivity is directly proportional to the product of the mean free path and thermal speed.Both thermal and electrical conductivity depend in the same way on not just the mean free path, but also on other properties such as electron mass and even the number of free electrons per unit volume. But as we have seen, they depend differently on the thermal speed of the electrons-electrical conductivity is inversely proportional to it and thermal conductivity is directly proportional to it. The upshot is that the ratio of thermal to electrical conductivity depends primarily on the square of the thermal speed. But this square is proportional to the temperature, with the result that the ratio depends on temperature, T, and two physical constants: Boltzmann's constant, k, and the electron charge, e. Boltzmann's constant is, in this context, a measure of how much kinetic energy an electron has per degree of temperature.Putting it all together, the ratio of thermal to electrical conductivity is:( 2 / 3 ) * ( (k/e)2 ) * Tthe value of the constant multiplying T being: 2.45x10-8 W-ohm-K-squared.http://www.physlink.com/education/AskExperts/ae432.cfm
What is a thermal conductor metal?
Good thermal conductivity is characteristic of the metals. Some of the best conductors are silver, copper, gold, aluminum, nickel and iron. Please see the link.
Does glass have a higher thermal conductivity than wood?
Depending on the glass, it has a K value between 0.8 and 1.1 Wood has a K value of between 0.04 and 0.4 The higher the K value the better the thermal conductivity. Thus glass has a higher thermal conductivity than wood.
What are conductivity metals?
Metals have a higher electrical and thermal conductivity than nonmetals.
What are elements that show moderate electrical conductivity?
Semiconductors are elements that show moderate electrical conductivity. Metalloids are elements that show properties of both metals and nonmetals.
What property of metallic bonds affect the thermal and electrical conductivity of metals?
electron negativity
What are characteristics of metals nonmetals and noble gasses?
Some characteristics Of Metals, Nonmetals, And Metalloids: Metals: High thermal and electrical conductivity Hard, dense, and solid (except For Mercury [which is a liquid]) Strong Malleable Ductility Luster Sonorous High melting points High tensile strength Nonmetals: Do not conduct heat and electricity very well Dull Brittle Not sonorous Insulators Low melting point Low tensile strength Metalloids: Semi-conductors Low conductivity
Is the electrical conductivity of molten metals high or low?
Metals are already good electrical conductors, and melting metals increases their electrical conductivity. All that heat (thermal energy) allows electrons a lot more mobility so they can more effectively contribute to current flow.
One property of most nonmetals is that they are what?
High ionization energy and poor electrical conductivity
In general metals are .?
Generally metals are hard, dense, with good thermal and electrical conductivity, can form cations, many are malleable or ductiles, etc.
What factor should change in electrical conductivity of metals and non metals?
Electrical conductivity depends on temperature.
How are metalliods different from metals?
Metalloids have some properties similar to properties of non metals; metalloids have bad thermal and electrical conductivity, they are brittle, soft etc.
Are alkali metals thermal or electrical conductivity?
The alkali metals are the most reactive metals in the periodic table of elements.
The electron sea model of the metallic bond helps to explain why metals are what?
Properties of metals as high boiling point, high melting point, malleability, ductility, electrical conductivity, thermal conductivity, lustre are explained by the theory of metallic bonds.
What has the author Martin Fuller Angell written?
Martin Fuller Angell has written: 'Thermal conductivity of metals at high temperatures' -- subject(s): Conduction, Heat, Thermal conductivity, Metals
