Glass

High school (ages 12+)
Science & Technology

Name:

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/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. What is the melting temperature range?Typically between 1,500°C and 1,700°C (2,732°F and 3,092°F) for common glass types
2. What is the annealing process?Controlled cooling to remove internal stresses and prevent fracture
3. What is glass made of?Glass is made mainly from silica sand, soda ash, and limestone. These ingredients are melted together at very high temperatures and then cooled quickly to keep the atoms from forming a crystal. The result is a clear, solid material that can be shaped into many forms.
4. Why is glass transparent?Glass is transparent because its atoms are arranged in a random, disordered way. This arrangement lets light pass through without being blocked or scattered, so we can see through it.

Amorphous Solid: A solid characterized by a disordered, non-crystalline arrangement of atoms or molecules.
Viscosity: A measure of a fluid's resistance to flow; molten glass has very high viscosity.
Annealing: A heat treatment process used to reduce internal stresses in glass, making it more stable.
Soda-Lime Glass: The most common type of glass, used for windows, bottles, and everyday items.