glass+presentation

Glass is a hard, non-crystalline and solid material normally fragile and transparent common in our daily life.

 The first glasses used in construction were used by the ancient Romans to produce small panels for windows in the 12th century. This ancient type of glass needed grinding and polishing. Glass can be shaped to any form and its cost depends on its features (Thickness, resistance to fire, abrasion…). It can also be produced in colors and varied according to its degree of transparency. In Architecture, glass is never used as a structural material, but is still essential in window and wall design. Glass became the main material in modern architecture when it replaced the space of the window to fill the entire space of the wall. With the help of other structural materials, glass can support itself to build a large variety of construction elements such as staircases, floors (using thick glass), canopies and walls.

__ Characteristic of glass __ These are the main characteristics of glass: Solid and hard material Disordered and amorphous structure - Fragile and easily breakable into sharp pieces - Transparent to visible light

- Inert and biologically inactive material.

 Glass is used for architecture application, illumination, electrical transmission, instruments for scientific research, optical instruments, domestic tools and even textiles. Glass does not deteriorate, corrode, stain or fade and therefore is one of the safest packaging materials. These properties can be modified and changed by adding other compounds or heat treatment.

 There are many types of glass, some of them are sugar glass (used to make thin objects that are easy to break), acrylic glass (also known as plastic glass since its composition is a mixture between glass and polymers to make it more resistant) and soda lime glass (is the one used commonly to fabricate window panels and bottles)

 <span style="display: block; font-family: Tahoma,Geneva,sans-serif; text-align: justify;">__ Advantages __ <span style="color: #000000; display: block; font-family: Tahoma,Geneva,sans-serif; font-size: 16px; text-align: justify;">There are the main advantages of glass <span style="color: #000000; display: block; font-family: Tahoma,Geneva,sans-serif; font-size: 16px; text-align: justify;">One important advantage of glass is that it's recyclable and there are almost limitless objects that can be made of glass that are very endurable if they're treated and used correctly. <span style="color: #000000; display: block; font-family: Tahoma,Geneva,sans-serif; font-size: 16px; text-align: justify;">Excellent abrasion resistance <span style="color: #000000; display: block; font-family: Tahoma,Geneva,sans-serif; font-size: 16px; text-align: justify;">Resistant to chemicals, solvents, oil, grease <span style="color: #000000; display: block; font-family: Tahoma,Geneva,sans-serif; font-size: 16px; text-align: justify;">No problem with UV degradation <span style="color: #000000; display: block; font-family: Tahoma,Geneva,sans-serif; font-size: 16px; text-align: justify;">Stable over a wide range of temperature <span style="color: #000000; display: block; font-family: Tahoma,Geneva,sans-serif; font-size: 16px; text-align: justify;">Easily cleaned <span style="display: block; font-family: Tahoma,Geneva,sans-serif; text-align: justify;">__ Disadvantages __ <span style="font-family: Tahoma,Geneva,sans-serif; font-size: 16px;">There are the main disadvantages of glass

<span style="font-family: Tahoma,Geneva,sans-serif; font-size: 16px;">The disadvantage of soda-lime glass is that is not resistant to high temperatures and sudden thermal changes. For example, everybody has experienced a glass breaking down when pouring liquid at high temperature, for example to make tea

<span style="font-family: Tahoma,Geneva,sans-serif;">__ Advances __ <span style="font-family: Tahoma,Geneva,sans-serif; font-size: 16px;">Recently developed forms of glass include:

<span style="font-family: Tahoma,Geneva,sans-serif; font-size: 16px;">- __Safety glass__, constructed of two pieces of plate glass join by a plastic to prevent the glass from scattering when broken.

<span style="font-family: Tahoma,Geneva,sans-serif; font-size: 16px;"> - __Fiberglass__ made from molten glass formed into continuous filaments that is used for fabrics or electrical insulation

<span style="font-family: Tahoma,Geneva,sans-serif; font-size: 16px;"> - __Foam glass__ made by trapping gas bubbles in glass to produce a spongy material for insulating purposes.

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