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What are the mechanical properties of photochromic plastic im looking for the malliebility ductility thermal conductivity electrical resistance and dielectric strength for an assignment?
Wiki User
∙ 11y ago
Photo chromic plastic properties are; the rear surface of the glass has a different radius than the front surface of the plastic, so that the space between the lenses forms a tapered gap which is filled by the elastic adhesive. The edge thickness of the elastic adhesive is sufficient to insure that the increase in diameter of the plastic layer with respect to the diameter of the glass layer due to differences in the thermal expansion characteristic of the glass and the plastic will not damage the composite lens even over a temperature range greater than 300° F.
Wiki User
∙ 11y ago
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Why is water the enemy of insulation?
Water decreases the overall thermal performance of the insulation, also water may just short circuit around the insulation and render it useless.Water, if present on dielectric surface, due its high conductivity decreases the surface resistivity of the dielectric, thus causes high creepage current (surface current).
For an insulating material dielectric strength and dielectric loss should be respectively?
For an insulating material dielectric strength and dielectric loss should be respectively
What happens when dielectric breakdown occurs?
The dielectric,usually the insulator between the plates of a capacitor, can be overstressed by the application of too high voltages applied to the capacitor plates. The dielectric breaks down and a current flows between the plates until,either they are discharged, or an equilibrium is reached,below the working voltage of the capacitor. If the dielectric is damaged in this process he capacitor must be replaced. Some dielectric material self heal and can recover from an over voltage.
What is the material use in the capacitor?
Capacitors are named after their dielectrics. So, an 'air capacitor' uses air as its dielectric, a 'mica capacitor' uses mica as its dielectric, and so on. There are lots of different dielectric used to separate the plates of a capacitor, each with different permittivities and dielectric strengths. As the perfect dielectric (i.e. one with both a very high permittivity and a very high dielectric strength) doesn't occur, the choice of dielectric is always a compromise between it permittivity and dielectric strength.
Is dielectric strength the same as dielectric constant?
No, these are two unrelated properties of a material.
Why does dielectric constant decrease with an increase in temperature?
If the temperature increases, the conductivity will increase too which means the dielectric constant is reduced
What dielectric materials are good thermal conductors?
The best example of a dielectric with good thermal conduction is diamond, which is almost a perfect dielectric, but also has a thermal conductivity (up to 41kW·m−1·K−1) that is better than most metals (e.g. silver has a thermal conductivity of 0.430kW·m−1·K−1).
What would be an Example of physical property?
weight, length, width, color, density, conductivity, dielectric constant
The presence of alkali oxides in alumino silicate ceramics is likely to result in dielectric breakdown due to?
It is probably due to conductivity. Not 100% Sure --Chetan
What are the physical properties of a gas?
density, thermal conductivity, speed of sound, melting point, boiling point, viscosity, refractory index, dielectric constant, etc.
Why water is not used as a dielectric medium?
Water is a fine dielectric. One of the main issues is that it ionizes certain materials. If it comes in contact with metals, some ions may be leached into the water. This thus raises the conductivity of the water. Good dielectrics are bad conductors. This helps the capacitor store more charge. If the water becomes conductive, it fails as a good dielectric.
Why is water the enemy of insulation?
Water decreases the overall thermal performance of the insulation, also water may just short circuit around the insulation and render it useless.Water, if present on dielectric surface, due its high conductivity decreases the surface resistivity of the dielectric, thus causes high creepage current (surface current).
Which quantity is independent of the size and shape of an object composed of a given material?
I can think of the Density, and the Specific Heat for a start. Various others also apply such as Thermal Conductivity and Electrical Conductivity, Dielectric Constant. You could also add Melting Point, Evaporation Point. In fact anything which is a property of the material not the object.
For an insulating material dielectric strength and dielectric loss should be respectively?
For an insulating material dielectric strength and dielectric loss should be respectively
What is dielectric constant in chemical terms?
dielectric constant
For an insulating material dielectric strength and dielectric loss should be respectively high or low?
For an insulating material dielectric strength and dielectric loss should be respectively high or low
What is dielectric test in transformer?
why need dielectric test for transformer
