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A window is an opening in a wall or roof of a building, in a car etc., to let air and light in. It is usually filled with a sheet of glass. There can be many different shapes and sizes, including rectangular, square, circular, or irregular shapes. Some windows include coloured glass. Windows are usually transparent so that people can see through them.
Before glass was used in windows, people in Asia used paper to fill the hole in the wall. The paper would let light in.
Types of window
These are different types of windows. They are:
A double-hung sash is a window that has two horizontal sash at the top and bottom that can move up and down.
Stained glass window
A stained glass window is a window that is made up of pieces of colored glass. The colored glass can be transparent, translucent or opaque. It usually shows people or places. Usually the glass in these windows is separated by lead rods. Stained glass windows are very common in churches.
How they are made
Many windows have movable window coverings such as blinds or curtains. They keep out light, give extra insulation. It also ensure privacy. Windows allow natural light to enter. But too much can have bad effects such as glare and heat gain.
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