Glass

What is glass? Glass is a brittle material that you can see through.

Glass is brittle, but can be strengthened for use in cars.

Glass is a hard, transparent strong yet brittle material. When it is molten it can be easily shaped and is used for making all kinds of electric lights. Glass is also an insulator.

A light bulb is made by dropping a lump of molten glass into a mould. The mould has the shape of a light bulb. Air is blown into the glass and makes a large bubble that pushes the glass into the sides of the mould. As the glass cools it takes up the shape of the mould and when it is released it has a light bulb shape.

Automated machines can produce a thousand light bulbs a minute.

Although glass is brittle, it is also very strong. Glass is used in windows. It is only liable to break if it is given a hard tap. You can see how strong glass can be when you see it used as television tables and as roofing glass panels.

Video: a video of recycled glass is available.

Explore these further resources...

(These links take you to other parts of our web site, never to outside locations.)

You can search in these books:


You can look in this topic for more books, videos and teacher resources:

Jump to Materials toolkit screen
The toolkit screen link will take you to a library containing a selection of:
an i-topic, more books, pictures, videos and teacher's stuff related to the search word.
© Curriculum Visions 2018