Search results
Results From The WOW.Com Content Network
Few missions have targeted Mercury because it is very difficult to obtain a satellite orbit around the planet. Mercury orbits the Sun very quickly (between 24.25 miles per second (39.03 km/s) and 30 miles per second (48 km/s)), so spacecraft must be travelling very fast to reach it.
Mercury is one of four terrestrial planets in the Solar System, which means it is a rocky body like Earth. It is the smallest planet in the Solar System, with an equatorial radius of 2,439.7 kilometres (1,516.0 mi). [4] Mercury is also smaller—albeit more massive—than the largest natural satellites in the Solar System, Ganymede and Titan.
The mercury is then recycled to the primary cell by a pump situated at the bottom. The mercury process is the least energy-efficient of the three main technologies (mercury, diaphragm and membrane) and there are also concerns about mercury emissions. It is estimated that there are still around 100 mercury-cell plants operating worldwide.
Mercury is a chemical element ... calling for energy-efficient lightbulbs to be made mandatory by 2012 encouraged China to re-open cinnabar mines to obtain the ...
Methylmercury (sometimes methyl mercury) is an organometallic cation with the formula [CH 3 Hg] +. It is the simplest organomercury compound. Methylmercury is ...
If you were born with Mercury in Gemini, your mind is swift, curious and always eager to obtain new information.As Gemini’s planetary ruler, this Mercury sign makes you a natural communicator ...
Mercury compounds are reduced to elemental mercury simply by low-temperature heating (500 °C). Tin and iron occur as oxides and can be reduced with carbon monoxide (produced by, for example, burning charcoal) at 900 °C. Copper and lead compounds can be roasted to produce the oxides, which are then reduced with carbon monoxide at 900 °C.
Mercury(II) sulfide, HgS, adopts the cinnabar structure described, and one additional structure, i.e. it is dimorphous. [16] Cinnabar is the more stable form, and is a structure akin to that of HgO : each Hg center has two short Hg−S bonds (each 2.36 Å ), and four longer Hg···S contacts (with 3.10, 3.10, 3.30 and 3.30 Å separations).