IUPAC Green Book[3] in that, in terms of its definition [4], pH = âlg a. H. it involves a single ion quantity, the activity of the hydrogen ion, which is immeasurable by any ther-. modynamically valid method and requires a convention for its evaluation.
The series officially premiered on July 17, 1999. It has received worldwide critical acclaim since its premiere and gained enormous popularity by its second season. A feature film, The SpongeBob SquarePants Movie, was released in theaters on November 19, 2004, and a sequel was released on February 6, 2015.
Facebook however, actually started out in theory on October 23, 2003 when Zuckerberg launched Facemash.com. Facemash allowed visitors (basically his Harvard classmates) to compare two student pictures side-by-side to let them decide who was hot and who was not.