Use a hollow steel ball with a threaded steel  plug.   Immerse in water to 
fill.  Thread plug, close tightly.   Immerse in liquid nitrogen behind a strong 
shield.  Water will shortly freeze, but cannot expand.  Eventually, the 
container will explode due to increased pressure. 
 
  On Wed, Dec 1, 2021 at 6:33 AM, Karl<gmk...@gmail.com> wrote:   I'm not sure 
how to build a bomb out of water.
  

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