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.
Hillenburg announced that he was putting the series on hiatus while he focused on the theatrical movie. At the time, no one knew if more SpongeBob episodes would be forthcoming. The movie, released on Nov. 19, 2004, was a popular and critical hit, and a fourth season was announced.