What is Glass?

Glass is a solid material that is typically transparent and made by melting sand and other ingredients at high temperatures.

Properties of Glass

- Transparent: Glass allows light to pass through, making it useful for windows and lenses.

- Brittle: Glass can break easily if dropped or subjected to force.

- Non-porous: Glass does not absorb liquids, making it a popular choice for containers and bottles.

- Soda-lime glass: The most common type of glass used for windows, bottles, and tableware.

- Borosilicate glass: Known for its resistance to thermal shock, often used in laboratory equipment and kitchenware.

- Tempered glass: Heat-treated for increased strength and safety, commonly used in car windows and shower doors.

- Windows and doors: Glass is used in buildings for windows and doors to allow natural light into the space.

- Containers: Glass containers are used for storing food, beverages, and other products due to their non-porous nature.

- Optical lenses: Glass is used in the production of eyeglasses, cameras, and telescopes due to its transparency and ability to refract light.

- The earliest known glass objects were made in Egypt around 1500 BCE.

- Glass can be recycled indefinitely without losing quality or purity.

EARTH AND SPACE SCIENCE (NGSS)

Earth’s Place in the Universe

Students who demonstrate understanding can:

Use observations of the sun, moon, and stars to describe patterns that can be predicted.

Make observations at different times of year to relate the amount of daylight to the time of year.