Definition of Allegory & Examples

Literature Periods

A form of extended metaphor in which objects, persons, and actions in a narrative, either in prose or verse, are equated with meanings that lie outside the narrative itself. Thus, it represents one thing in the guise of another—an abstraction in that of a concrete image. The characters are usually personifications of abstract quality, the action and the setting representative ...

Read More »


Ceramics Ceramics are inorganic, non-metallic, solid materials and can be crystalline or non-crystalline. Ceramics possess a covalent network  structure or ion bonding or a combination of the two. Ceramics are hard and brittle but stable to high temperatures. The important products of ceramic industries are building bricks and tiles, sewer pipes, drain tiles, all kinds of refractory bricks, electrical and ...

Read More »

Chloromethyl Silane

CHLOROMETHYL SILANE Chloromethylsilanes are the basic building blocks of all of our silicon-based materials. They are used in the basic synthesis of silanes and siloxanes and  as protecting agents for intermediates in pharmaceutical syntheses.

Read More »

Define Annealing,Quenching ,Tempering,Nitriding & Case-hardening

Annealing: It is the process of heating steel to redness followed by slow cooling. Quenching or Hardening: It is the process of heating steel to redness followed by sudden cooling and plunging the red hot steel into water or oil. Tempering: It is the process of heating the hardened or quenched steel to a temperature much below redness (350 °C) ...

Read More »

Invar – Nickel Iron Alloy Composition and Uses

Invar – Nickel Iron Alloy Composition and Uses The composition of invar is Iron = 64% and Nickel          36 %. It has low co-efficient of expansion and used for making pendulum rods, meter scales, measuring instruments.

Read More »


STAINLESS STEEL It has the composition. Iron = 73 to 79% Chromium = 14 to 18 % Nickel = 7 to 9 % Stainless steel is a corrosion resistant alloy and is used in making cutlery, automobile Parts, food manufacturing machinery, surgical instruments etc.

Read More »

Plain Carbon Steel and its Uses

PLAIN CARBON STEEL This steel contains iron, carbon and small amounts of other elements. About 95% of the total world, Crude-steel output belongs to this class. It is plain carbon steel is further classified as follows:‑ a)        Low Carbon Steel in which carbon content is bellow 0.2%. b)       Medium Carbon Steel with carbon content from 0.2 to 0.5%. c)     ...

Read More »


STEEL Iron which contains 0.25 to 1.5% carbon and hardened by quenching is called steel. Other metals such as Mn, Ni, Cr, Mo, W and V are added to iron in small amounts to produce different types of alloy steels. Steel posses the useful properties of both cast iron and wrought iron. Its hardness and elasticity can be varied by ...

Read More »


WROUGHT IRON It is the purest form of iron and contains only 0.12 to 0.25% carbons. It is obtained by melting pig iron with an excess of iron oxide which oxidizes impurities. Wrought iron is soft, malleable and ductile.

Read More »


GREY CAST IRON When molten pig iron is cooled slowly, the carbon separates as graphite giving iron a grey colour. This is called grey cast iron.

Read More »
watch free movies online

© Copyrights 2014. All rights are reserved