Question 10200
What's the formula for the volume of a cube whose edges are x inches.  Why, it's just {{{x^3}}}.

So, the glass cubic sculpture, which has sides of 9.5 inches, has a volume of{{{(9.5)^3}}}cubic inches.
And what's {{{9.5)^3}}}?  It's (9.5)(9.5)(9.5) = 857.375 cubic inches.

You can find {{{9.5)^3}}} in your calculator by entering 9.5 then ^ (the caret) then enter (or =) 

So, the answer to your question is:
  He needed 857.375 cubic inches of liquid glass to make his sculpture.