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no
A2: Not necessarily. Solid plastics or solid glass or ceramic have high dielectric strength but not good thermal insulation. Closed-cell foam has good thermal insulating properties but not as good a dielectric strength as solid--there are pockets of gas or air in it. The D.S. is not much better than using the same volume of gas, alone.
What else can I help you with?
What are bad insulators?
Anything metal is a bad insulator. Especially copper, in fact, most metals are conductors!! Anything metal is a bad insulator. Especially copper, in fact, most metals are conductors!!
Is beryllium conductive?
The thermal conductivity of beryllium is 200 W/m.K.
How is mica an insulating material?
Mica is actually a group of minerals mined around the world, but with notable deposits in Africa and Russia.It has a number of interesting properties making it useful in a variety of specialized applications. Sheet mica has long been used in the electronic and electrical industries because of its combination of electrical, thermal insulating properties and its mechanical properties. Mechanically, it can be shaped, cut, drilled and the natural layered structure allows sheets to be created. It is a good electrical insulator at the same time as being a good thermal conductor which is an uncommon combination.In an electric iron, its mechanical properties and thermal properties are decisive in why it is employed. Plastic would melt, or a metal conduct too much electricity and most other minerals would be brittle or difficult to shape as needed.Because Mica is very good at conduting heat AND it won't melt under high heat
Why is aluminum useful?
Aluminum is useful because it is lightweight, corrosion-resistant, and easily recyclable. It is commonly used in various industries such as construction, transportation, and packaging due to these qualities. Additionally, aluminum has good electrical and thermal conductivity properties.
What are the electrical properties of gases?
Gases are poor conductors of electricity in their natural state because their molecules are too far apart to facilitate electron flow. However, some gases can become conductive when ionized by high voltage or temperature, leading to their use in applications like neon lights or plasma displays. Additionally, gases can act as insulators in certain conditions, such as the insulating properties of air in electrical transmission lines.
One material that is used as a conductor and one that is used as an insulator?
A good insulator material is rubber and can block heat and electricity from almost anything. Glass is a good insulator too if you are trying to insulate electricity. Plastic is good as well. Most metals are OK conductors. Copper is very good, and Gold is the best, but it is heavy and expensive.
Are good electrical conductors often good thermal conductors too?
Yes, good electrical conductors are often good thermal conductors as well. This is because both processes involve the movement of free electrons, which carry heat or electricity through a material. Materials that allow the easy flow of electrons for electrical conduction also tend to allow the flow of heat energy, making them good thermal conductors.
What is a sentence with the word thermal?
The thermal energy is converted from electrical energy too. Water geysers are the appliances that do so.
What does not allow energy too pass through easily?
Materials that are insulators do not allow energy to pass through easily. Insulators have high electrical resistance and do not conduct electricity well. Common examples include rubber, glass, and wood.
What are bad insulators?
Anything metal is a bad insulator. Especially copper, in fact, most metals are conductors!! Anything metal is a bad insulator. Especially copper, in fact, most metals are conductors!!
Why houses of north India are made up of mud?
Mud houses are extremely cheap to build. Also they are a good insulators, not too hot in summers and not too cold in winters.
What is a good sentence for the word thermal expansion?
Thermal expansion is the tendency of matter to change in shape, area, and volume in response to a change in temperature.
Why is copper so useful for electrical writing in a house?
It's a very good electrical conductor, strong and the cost is not too high.
Types of energy transformed into thermal energy?
i want to know too. answer- chemical energy
Why are things with a low density good insulators?
A good insulator is a substance that does not allow energy to flow very quickly when there is a temperature difference between two areas. The most important component of good insulators is stationary air because air is a poor conductor of heat. Good insulators contain millions of tiny air spaces, which slow heat conduction through them. Thus, the heat is "kept in" or "kept out". Insulators with a lower density means there is space between the particles/molecules of the material. Having the right density is critical in whether a material makes a good insulator or not. If there is not enough density, air will flow too quickly through the material; if the density is too high no air will be trapped in the material and cool air will flow quickly to the other side.
Is beryllium conductive?
The thermal conductivity of beryllium is 200 W/m.K.
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
