ic ▁re cept ors ▁ ▁B eta , ▁a ▁rank ▁in ▁a ▁community ▁of ▁social ▁animals ; ▁See ▁Al pha ▁ ▁B eta ▁carbon , ▁in ▁organ ic ▁chem istry — the ▁second ▁carbon ▁atom ▁in ▁a ▁chain ▁when ▁counting ▁from ▁a ▁functional ▁group ; ▁See ▁Al pha ▁and ▁beta ▁carbon ▁ ▁B eta ▁cell , ▁a ▁type ▁of ▁cell ▁in ▁the ▁pan cre as , ▁which ▁produces ▁ins ul in ▁ ▁B eta ▁sheet , ▁a ▁secondary ▁protein ▁structure ▁ ▁B eta - end orph in , ▁a ▁kind ▁of ▁ne uro trans mit ter ▁ ▁Physics ▁ ▁B eta ▁( pl asma ▁physics ), ▁the ▁ratio ▁of ▁thermal ▁to ▁magnetic ▁pressure ▁in ▁pl asma ▁ ▁B eta ▁( vel ocity ), ▁the ▁speed ▁of ▁an ▁object ▁relative ▁to ▁the ▁speed ▁of ▁light ▁▁ β , ▁a ▁symbol ▁for ▁compress ibility , ▁a ▁measure ▁of ▁the ▁relative ▁volume ▁change ▁of ▁a ▁fluid ▁or ▁solid ▁as ▁a ▁response ▁to ▁a ▁pressure ▁change ▁ ▁B eta ▁function ▁( physics ), ▁also ▁ β ( g ) — a ▁function ▁in ▁quantum ▁field ▁theory ▁ ▁B eta ▁particle , ▁a ▁name ▁used ▁to ▁refer ▁to ▁high - energy ▁electrons ▁( β − ) ▁or ▁posit rons ▁( β +) ▁em itted ▁by ▁certain ▁types ▁of ▁radio active ▁nuc lei ▁ ▁Ph ase ▁Constant ▁( β ), ▁in ▁elect romagnet ics ▁and ▁elect rical ▁engineering , ▁used ▁in ▁the ▁theory ▁of ▁plane ▁waves ; ▁See ▁Pro pag ation ▁constant ▁ ▁P rec ursor ▁yield ▁fraction ,