self-contained
Description:
Shows
that
air
takes
up
space.
Rotate
the
bottles
180
degrees
end
over
end.
The
blue
liquid
will
pour
into
the
bottom
bottle,
causing
a
fountain
in
the
top
bottle,
which
shows
that
the
air
is
taking
up
space
and
traveling
from
the
bottom
bottle
to
the
top.