Lead 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/lead-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 material classification?An amorphous solid, despite the common marketing term 'crystal'
2. What is the regulatory definition?EU regulations specify minimum PbO content for 'lead crystal' labeling
3. What is lead glass and why is it called crystal?Lead glass is a special kind of glass that has lead oxide added to it. It is called crystal because it was made to look like natural crystal, with a bright sparkle.
4. Why does lead glass sparkle so much?The lead in the glass makes light bend more and split into colors, so it reflects light inside and creates a sparkling effect.

Lead(II) oxide (PbO): A chemical compound that imparts high refractive index and density to glass.
Refractive Index: A dimensionless number describing how fast light travels through the material relative to a vacuum.
Dispersion: The phenomenon where the phase velocity of a wave depends on its frequency, causing light to split into colors.
Amorphous Solid: A solid lacking the long-range atomic order characteristic of crystalline solids; its atoms are arranged randomly.