Video: The Sensory System: Definition, Parts & Functions. This lesson will examine how the sensory systems are integrated and how they function as a whole. Instead of telling you ears hear and eyes see, we will examine how these systems are actually very similar in terms of reception, signals, and translations.
Mercury is a silvery-white metal element that is liquid at ordinary room temperature; it has no taste or smell. It occurs as metallic mercury (Hg), as cinnabar (HgS) and in perhaps 25 other in organic mineral compounds. The elemental form (Hg) vaporizes at any temperature down to almost 40Â° below zero. The vapor also has no taste or smell. The specific gravity of mercury is 13.546; therefore, it is heavier than lead and, like lead and other heavy metals, it is a potent poison. Exposure to metallic mercury or mercury compounds, even in small quantities over a period of time, can cause severe poisoning.
Harmful effects: Mercury and most of its compounds are highly toxic. The pure metal is absorbed easily by inhalation, ingestion or through the skin. It is also a chronic pollutant and mercury concentrates in animal/fish tissues in increasing amounts up the food chain.t is the only common metal that is liquid at room temperature. Mercury evaporates slowly at room temperature. Others metals that are liquid near room temperature are gallium, francium and cesium. The metal is relatively stable in dry air, but in moist air tarnishes slowly to form a gray oxide coating.