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                                                       =
                                                               

                                     N/m    2

            ρ                   Kg/m    3







                                                                                              





                                                                           ρ




                                                               
                                                       =
                                                               

                                      N/m   2
            ρ                   Kg/m    3







                                  



                                                                = γ  






                                                                        
                                              =        ↔    =      γ
                                                                        


                                                                                              
                                                                                       =      ,
                                                                                             



                                                                 
                                                     =    γ
                                                               
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