Float glass

High school (ages 12+)
Science & Technology

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Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/float-glass

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. How tall is Float glass?Molten tin serves as the flat, non-reactive surface for glass formation
2. What is Float glass known for?Produces glass with exceptional flatness and optical clarity, minimizing post-production finishing
3. What is the process name?Float glass process, also known as the Pilkington process
4. What is the primary glass composition?Predominantly soda-lime glass, but adaptable for borosilicate and display glass
5. What is float glass and how is it made?Float glass is a very smooth, flat sheet of glass. It is made by pouring hot glass onto a bath of liquid tin, where the glass spreads out and cools into a perfect sheet.
6. Why do they use tin to make float glass?Tin is used because it is very dense and melts at a low temperature. It also doesn’t mix with the glass, so the glass stays on top and stays flat.

Surface Tension: The cohesive force on the surface of a liquid that allows it to resist an external force.
Soda-Lime Glass: A common type of glass composed primarily of silica, sodium carbonate, and calcium oxide.
Borosilicate Glass: A type of glass known for its low thermal expansion and resistance to thermal shock.