Editor’s Note on “Frontier Outlook” Column

In this issue,we are pleased to carry on the theme of Frontier Outlook(https://doi.org/10.1002/eem^(2).12313)to publish the invited contribution“The Transference Number”from Prof.Balsara and colleagues.As one of the“triad properties”required to fully describe an electrolyte(i.e.,conductivity,diffusivity,and transference number),the last proved to be the most challenging quantity that can be accurately and reliably determined,as evidenced by the widely scattered data from different techniques。