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...carbon dioxide (CO2), which must be continuously removed. The process by which O2 and CO2 are exchanged between the body and the environment is termed external respiration. On average, an adult takes between 12 and 18 breaths a minute at rest, exchanging more than 8000 litres of air per day. Using the glossary This course includes a glossary, as demonstrated by the terms...

...carbon or nitrogen) lose their energy and stop moving. The compressive stresses generated in the surface layers improve mechanical and fatigue properties, as well as corrosion and wear resistance...[Images to demonstrate 'Ion Implantation' - see article] Manufacture: Process is not a surface coating process but implants ions below the surface, into the matrix of the...

...carbon-hydrogen bonds – is actually ubiquitous throughout the universe. One of the big questions is whether organic compounds can be delivered to planets to form the basis for life. We are still not sure how life started on Earth. If this did happen, comets and asteroids are good candidates as a transport vehicle. The same story applies to water. We clearly have a lot...

...carbon equivalent value. Group B. Heat-treatable alloys with mechanical properties affected by the welding process: e.g. plain carbon steel, alloy steel and precipitation-hardening Al-alloys. Group C. Materials which form brittle alloys or intermetallic compounds at the weld interface. This intermediate layer can usually be controlled to a few micrometers: e.g.:...

...carbon and oxygen. [deep sky image of the constellation Orion] The constellation Orion A good example of stars at different stages of their lives may be seen in the constellation of Orion, the hunter. Comprising seven bright stars, Orion is a familiar shape in the night sky – two stars mark his shoulders, and two stars mark his knees, with a belt of three stars across...