properties of insulating materials

Conductors and Insulators - Substances which allow electricity to pass through them easily are called conductors. These are made from materials which have low resistances. Metals like copper, aluminium, silver, iron, brass and also salt solutions are good conductors of electrici..

Substances which do not allow electricity to pass through them easily are called insulators. These are made from materials which have a high resistance. Some substances which are insulators are air, plastic, cotton, rubber, wood, paper, glass, pure water, etc. Substanc..

Substances which do not allow electricity to pass through them easily are called insulators. These are made from materials which have a high resistance. Some substances which are insulators are air, plastic, cotton, rubber, wood, paper, glass, pure water, et..

In case of certain materials like glass, the electrons are firmly 'bound' to the atoms and they do not normally move. Such materials are known as the 'insulators' or bad conductors of electricity. Polythene, ebonite, silk, fur, plastic etc. belong to this category. The..

Michael Faraday discovered that a specimen of bismuth was repelled by a strong magnet. Diamagnetism occurs in all materials. These materials are those in which individual atoms do not possess any net magnetic momen..

Conductors and Insulators - Substances which do not allow electricity to pass through them easily are called insulators. These are made from materials which have a high resistance. Some substances which are insulators are air, plastic, cotton, rubber, wood, p..

Matter exists in several phases. If we look at all objects around us, we perceive that some materials have a definite shape and occupy a definite amount of space or volume. We call these materials solids and we can name many objects that are solids. We say that solids have a def..

(e.g., O 2 , Cu 2 + , Fe 3 + ) are attracted by a magnetic field but lose their magnetism in the absence of the magnetic field. This property is shown by those substances whose atoms, ions or molecules contain unpaired electron..

Electrical conductivity varies from 10 8 Ohm cm - 1 in metals to 10 - 1 2 ohm - 1 cm - 1 in insulators. Based on their conductivity solids can be divided into three categories. (a) Conductors (b) Semiconductors (c) Insulators..

Properties of Catalysts - Catalyst Examples Function Metals Fe, NI, Pt, Ag Hydrogenation Dehydrogenation Semiconducting oxides and sulphides MO, ZnO, MgO, Si 2 O 3 /MoO 3 , MoS 2 Oxidation Desulphurization Insulating oxides A1 2 O 3 , SiO 2 , MgO Dehydration Acids SiO 2 /Al 2 O ..