Subject: Can an object expand if it where placed inside an in-expandible object?

As an object gets heated it expands.  If the objet were 
spherical with a hollow cavity, when the sphere expands the 
cavity also expands creating a larger cavity, right?  Suppose 
the object were a 2 ft Dia. sphere with a ½ ft Dia. hole in the 
center made of a hard carbon steel that begins to expands at 
9000o F.  And a second object being a ½ ft Dia. sphere with a 
1in Dia. hole in the center made of a hard steel that begins to 
expands at 1000o F.  If the ½ ft dia sphere where to be place 
inside the 2 ft dia sphere and the latter where heated to 2000o 
F as the ½ ft dia sphere tries to expand, but can’t due to the 
in-expansion of the 2 ft dia, what happens to the 1 in cavity of 
the ½ ft dia sphere?  Does it still get bigger, or does it begin 
to close?  If it does close, how much pressure is exerted in the 
center of that sphere?

Re: Can an object expand if it where placed inside an in-expandible object?