2.6 How glass is made
2.6 How Glass is made.
Pointers
Q.1-
Every day thing's made of glass from Sand glass is made by a mixture of clean white sand and chemicals like soda and lime.
What you can do with hot liquid glass?
→ Hot Liquid glass can be blown in to bottles bulbs glasses and other objectes liquid glass can be also drawn out in to very thin fibres or glass wool.
Name of colours.
pink amber.blue, violet, turquoise, ruby red purple, amethyst, dark green, even orange, deep yellow, black and white.
Q.2.
molten - तप्त,
transparent - पारदर्शक
Imperable - अछिद्र
Impart-देणे,
recyclable-पुनर्वापर करण्याजोगा.
molten - तप्त,
transparent - पारदर्शक
Imperable - अछिद्र
Impart-देणे,
recyclable-पुनर्वापर करण्याजोगा.
Q.3.
i) How glass is made ?
Heating a mixture of clean white Sand and chemicals like soda and lime.
Mixture is heated in furnace till it turn's. in to hot, liquid glass.
When it cools down it becomes stiff and Hard.
ii) How glass is shaped ?
When the glass is hot and soft it is possible to shape it.
Very hot glass like a mould it roll it to make a
liquid pour it,press it or blow it variety of shapes.
Hot liquid glass is poured into moulds and hardened to make articles. of various shapes and sizes.
iii) Some Properties of glass -
Transparent - You can see through it. It is strong and hard, You can put load.
Imperable- It does not allow water other liquids to pass through and it doesn't get soggy or stained itself.
Ordinary glass has a smooth surface and it can be washed easily and it
looks beautiful.
Q.4→
Paper recycling
Plastic recycling
Plastic recycling includes melting down soft drink bottles and then casting them as plastic chairs and tables, plastic recycling is process of recovering scrap or waste plastics.
Verbs
Come ,make,
go, give, talk, bring,
i) How glass is made ?
Heating a mixture of clean white Sand and chemicals like soda and lime.
Mixture is heated in furnace till it turn's. in to hot, liquid glass.
When it cools down it becomes stiff and Hard.
ii) How glass is shaped ?
When the glass is hot and soft it is possible to shape it.
Very hot glass like a mould it roll it to make a
liquid pour it,press it or blow it variety of shapes.
Hot liquid glass is poured into moulds and hardened to make articles. of various shapes and sizes.
iii) Some Properties of glass -
Transparent - You can see through it. It is strong and hard, You can put load.
Imperable- It does not allow water other liquids to pass through and it doesn't get soggy or stained itself.
Ordinary glass has a smooth surface and it can be washed easily and it
looks beautiful.
Q.4→
Paper recycling
The process of waste paper with recycling involves mixing used paper u
water and chemicals to break it down, It is chopped up and heated. This resulting mixture is called pulp. It is strained through screens, which remove any glue that may still be in mixture, then cleaned
de-inked bleached and mixed with water. then it can be made into new recycled paper.
water and chemicals to break it down, It is chopped up and heated. This resulting mixture is called pulp. It is strained through screens, which remove any glue that may still be in mixture, then cleaned
de-inked bleached and mixed with water. then it can be made into new recycled paper.
Plastic recycling
Plastic recycling includes melting down soft drink bottles and then casting them as plastic chairs and tables, plastic recycling is process of recovering scrap or waste plastics.
Verbs
Can you think of Some verbs that are
used very often ?
used very often ?
Come ,make,
go, give, talk, bring,
cut,read write, join.
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