WHY RVS BROTH NEED TO BE STERILIZED AT 115 TEMP. - (Aug/14/2013 )

SIR PLEASE LET ME KNOW WHY WE NEED TO STERILIZE RVS BROTH AT 115 TEMP.

You don't, you could sterilize it by other methods, but autoclaving (which is what you are referring to) is effective at killing bacterial and yeast spores and is cheap, quick and doesn't require quite specialized equipment.