HOW GLASS IS MADE

Glass used in a lot of human equipments comes from raw materials which pass the making process of glass. There are three steps in making of glass. They are melting, cooling, and forming.
The first step is melting. The raw materials containing silica which is from white sand or pulverized sandstone, soda (sodium bicarbonate), and lime which is from limestone are melted together at 2600 until 2900 Fahrenheit in furnace. The temperature depends on the composition of the raw materials. This step takes about twenty four hours.
The second step is cooling. After melting, the molten glass is then cooled until several hundreds degree at which it can be shaped. It has to be worked quickly to form it into the desired shape.
The last step is forming. The glass can be formed into bottles or plates. For glass bottles, molten glass is placed in a mould. Air is blown in and then the air pressure forces the glass against the side of the mould. When the glass cools and hardens, the mould is opened and a newly-made glass bottles removed. For glass plates, the sheet of glass is rolled flat along the assembly line. After it cools, the glass is ground and polished.


CAMELIA INDAH M.
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Water

One of important needs of human is water. Water is a very important need for the human life because in daily life, everybody needs clean water for drinking, cooking, bathing, washing, and others. The sources of clean water are limited because there are a lot of water's sources which have been polluted so that it's necessary to do the water treatment process in order to fulfill the quality of clean water. Raw water which comes from ground and surface water has to pass the water treatment process such as separation and purification so that it can be distributed to the people for the daily need.

WHY ITB??

I have some reasons why I decided to continue my study at ITB. I chose ITB because there is environmental technology as one of study programmes. Besides that, ITB is the best school of technology in Indonesia which has good facilities and comfortable place for studying. The other reasons are students in ITB have great desire to study and people graduating from ITB aren’t doubted in work place. That’s why I chose ITB as a place to study.

Drawing

I don’t like drawing because of several factors. First, when I am asked to draw something, I can’t do it quickly. I need a long time to think about what things that I will draw. I often have no idea on it. Then, when I have got an idea about the things, I have difficulties to visualize my idea into a picture. I am difficult to make something into one dimension.