A physical property describes the substance without reference to any other substance.

Weight Volume Color Boiling Point Melting Point

A chemical property describes the behavior in relation to another substance.

It can be lodged in a suspects shoes or clothes.

Headlight glass can help identify a suspect’s vehicle.

Glass is made of silicon oxide and metal oxides.

Sand and metal oxides are melted and then cooled.

Window and bottle glass are made of soda-lime, sand and metal oxides.

Auto headlights and heat-resistant glass also have boron oxide.

Tempered glass is stressed glass that is rapidly heated and cooled.

Laminated glass is used as windshields and is made by sandwiching a piece of plastic between two pieces of window glass.

Pieces are put together like a puzzle. Refractive index: velocity of light in a

vacuum divided by the velocity of light in the medium.

Density: the mass divided by the volume.