Glass

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.

  __ Characteristic of glass __

Solid and hard material - 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.

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)
 * soda lime glass (is the one used commonly to fabricate window panels and bottles)

__ Advantages __

<span style="color: #000000; display: block; font-family: Tahoma,Geneva,sans-serif; font-size: 16px; text-align: justify;"> <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;"> __ Disadvantages __ <span style="font-family: Tahoma,Geneva,sans-serif;"> <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.

__**<span style="font-family: Tahoma,Geneva,sans-serif; font-size: 120%;">What are your conclusions about the use of glass in architecture/urban planning? **__

<span style="font-family: Tahoma,Geneva,sans-serif; font-size: 120%;">I think that glass is a beautifull material and their use in architecture is very aesthetic, but it can be use for ilumination of important spaces inside the building. it's a grat element to decoration and sometimes is used in walls, but it can't be a structural element because it is fragile and easily broken <span style="font-family: Tahoma,Geneva,sans-serif;">