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.
Well, SpongeBob has a date of birth: July 14, 1986. If we assume that the series takes place in our times, that would make him 28. However, Bart and Lisa Simpson have been 8 and 10 for more than 20 years now. So if we assume that his age is constant in the show (which premiered in July 17, 1999), that would make him 13.