mercury vapor
71National Christmas Tree (United States) — This article is about the Christmas Tree placed on the Ellipse near the White House. For the Christmas Tree placed inside the White House, see White House Christmas tree. For for the giant Sequoia known as the Nation s Christmas Tree , see… …
72Peter Cooper Hewitt — Infobox Scientist name = Peter Cooper Hewitt box width = image width =150px caption = Peter Cooper Hewitt birth date = May 5, 1861 birth place = New York City death date = August 25, 1921 death place = residence = citizenship = nationality =… …
73Vacuum tube — This article is about the electronic device. For experiments in an evacuated pipe, see free fall. For the transport system, see pneumatic tube. Modern vacuum tubes, mostly miniature style In electronics, a vacuum tube, electron tube (in North… …
74Combined cycle — Thermodynamics …
75Light fixture — This article is about architectural light fixtures. For stage lighting, see Stage lighting instrument. Many various light fixtures A light fixture, light fitting, or luminaire is an electrical device used to create artificial light and/or… …
76Amalgam (dentistry) — For other uses, see Amalgam (disambiguation). Amalgam filling on first molar Amalgam is an alloy containing mercury. The amalgam used as material for dental fillings is a mixture of mercury (50%), silver ( 22 32% ), tin ( 14%), copper ( 8%), and… …
77Weather testing of polymers — is the controlled polymer degradation and polymer coating degradation under lab or natural conditions.Just like errosion of rocks, natural phenomena can cause degratation in polymer systems. The elements of most concern to polymers are… …
78Ceramic discharge metal-halide lamp — The ceramic discharge metal halide (CDM) lamp, mostly referred to as Ceramic Metal Halide lamp (CMH), is a relatively new source of light that is a variation of the old (high pressure) mercury vapour lamp. The discharge is contained in a ceramic… …
79Amalgame dentaire — Pour les articles homonymes, voir Amalgame. En dentisterie, amalgame désigne un matériau utilisé pour obturer les caries qui se forment dans les dents après que leur partie cariée a été nettoyée. Bien qu encore appelé « plombage », l… …
80Maladie d'Alzheimer — Classification et ressources externes Comparaison d un cerveau normal âgé (gauche) et du cerveau d un patient atteint d une maladie d Alzheimer (droite). CIM …
