Re: Lighter materials migrating to where the gravity is lower: It
doesn't work that way. A pingpong ball on the surface has no way of
knowing that 1000 miles down it would be lighter.
What migrates up, and what migrates down, depends only on the local
gravitational field, and the relative densities of the items in
question. Locally, over the regions where convection is actually
sorting things out, the strength of gravity can be considered to be
constant.
Convection, just like the buoyancy force, is due to differential
pressure on the bottom and top of an object. When we're dealing with
tiny objects, the differential pressure is due essentially entirely to
the density of other "stuff" around the object, which results in
increasing pressure with depth. Again, on the scales which are relevant
to sorting molecules, fine particles, tiny bubbles, etc, gravity can be
treated as constant.
On 12/03/2016 11:21 AM, H LV wrote:
Q: why don't lighter elements find there way to the centre of the
Earth if gravity is lowest at the centre?
Harry
New study indicates Earth's inner core was formed 1 - 1.5 billion
years ago
October 7, 2015
http://phys.org/news/2015-10-earth-core-billion-years.html
On Sat, Dec 3, 2016 at 10:47 AM, H LV <hveeder...@gmail.com
<mailto:hveeder...@gmail.com>> wrote:
Possible generation of heat from nuclear fusion in Earth’s inner core
http://www.nature.com/articles/srep37740
<http://www.nature.com/articles/srep37740>
<<The cause and source of the heat released from Earth’s interior
have not yet been determined. Some research groups have proposed
that the heat is supplied by radioactive decay or by a nuclear
georeactor. Here we postulate that the generation of heat is the
result of three-body nuclear fusion of deuterons confined in
hexagonal FeDx core-centre crystals>>
Harry
