XPost: sci.physics   
   From: relativity@paulba.no   
      
   Den 06.01.2026 09:15, skrev Thomas Heger:   
   > Am Sonntag000004, 04.01.2026 um 20:51 schrieb Paul.B.Andersen:   
   >>   
   >> E = mc² is the energy content, or the energy equivalent of   
   >> the mass m. Mass is invariant, so this equation is valid for   
   >> all speeds of the mass.   
   >   
   > You contradicted yourself!!   
   >   
   > Here your claim is, that mass is invariant, while a little below you   
   > claim, that energy is conserved, while mass has vanished from a   
   > radioactive sample.   
   >   
   > But you can't keep both claims, because they contradict each other.   
      
      
   Invariant means "the same in all frames of reference"   
   or "independent of speed".   
      
   It does _not_ mean "constant".   
      
   Mass is invariant.   
   The mass of an object is the same in all frames of reference.   
   The mass of an object does not depend on the speed of the object.   
      
   But mass can change. Heat the object, and its mass will increase,   
      
   I have told you before, but I know you will not learn.   
   You never do.   
      
      
   --   
   Paul   
      
   https://paulba.no/   
      
   --- SoupGate-DOS v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)