This sign warns against nonflammable but still potentially dangerous gas. It has white writing and a white graphic set against a green background.

This hazardous substances sign warns of potentially dangerous organic peroxide oxidizing agent. The writing and graphic are in black while the background is a bright yellow.

This hazardous materials sign is to warn of potentially dangerous oxygen in the area.

This diagram shows a 3D computer generated image of the triatomic molecule known as ozone. Ozone is an allotrope that contains three oxygen atoms. The ozone layer found in the upper atmosphere helps protect the Earth against potentially...

This is a picture of the periodic table of chemical elements, an important set of information for anyone learning about chemistry. Elements such as hydrogen, carbon, oxygen, sodium, iron and gold are listed using their chemical symbols...

This hazardous materials sign warns against poisonous substances. The word poison is written in large black letters while the always intimidating skull and cross bones image can be seen above.

This is a close up photo of a powder steel sample. The image is very clear and you can easily see the individual steel grains against the white background.

A metal sample of small tungsten pieces are held in a clear container with a coin sitting at the end near the container lid.

A labeled photo of a 2D xray diffractometer located at the University of Helsinki. The labeled parts include the beamstop, slits, sample, vacuum tube and image plate detector.

This photo shows a close up view of zinc, a metallic chemical element with the symbol Zn.