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Van Allen radiation belt
noun
(astronomy,
physics)
Either
of
two
torus-shaped
areas
of
high-energy
charged
particles
which
partly
surround
Earth,
trapped
by
its
magnetic
field.
The
areas
are
characterised
by
intense
radiation.
When
the
belts
"overload",
particles
strike
the
upper
atmosphere
and
fluoresce,
causing
the
polar
aurora.
van der Waals gas
van 't Hoff's law
name
van 't Hoff factor
noun
A
measure
of
the
effect
of
a
solute
upon
colligative
properties
such
as
osmotic
pressure,
relative
lowering
in
vapour
pressure,
elevation
of
boiling
point,
and
depression
of
freezing
point.
It
is
the
ratio
between
the
actual
concentration
of
particles
produced
when
the
substance
is
dissolved,
and
the
concentration
of
a
substance
as
calculated
from
its
mass.
van der Waals strain
noun
van der Waerden's theorem
name
(mathematics)
In
Ramsey
theory,
a
theorem
stating
that,
for
any
given
positive
integers
r
and
k,
there
is
some
number
N
such
that
if
the
integers
{1,
2,
...,
N}
are
colored,
each
with
one
of
r
different
colors,
then
there
are
at
least
k
integers
in
arithmetic
progression
whose
elements
are
of
the
same
color.
Little Jost van Dyke
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