Emmett Brown Emmett Brown Emmett Lathrop "Doc" Brown, Ph.D., is a fictional character in the "Back to the Future trilogy" in which he is the inventor of the first time machine, built out of a DeLorean sports car. The character is portrayed by Christopher Lloyd in all three films, as well as in the live action sequences of the . He is voiced by Dan Castellaneta in the animated series. The character's appearance and mannerisms are loosely inspired by Leopold Stokowski and Albert Einstein. In 2008, Dr. Emmett Brown was selected by "Empire" magazine as one of "The 100 Greatest Movie Characters
PH cycle, and there is evidence of ongoing ocean acidification caused by carbon dioxide emissions. However, pH measurement is complicated by the chemical properties of seawater, and several distinct pH scales exist in chemical oceanography. As part of its operational definition of the pH scale, the IUPAC defines a series of buffer solutions across a range of pH values (often denoted with NBS or NIST designation). These solutions have a relatively low ionic strength (≈0.1) compared to that of seawater (≈0.7), and, as a consequence, are not recommended for use in characterizing the pH of seawater, since the ionic strength differences