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.
He began developing SpongeBob SquarePants into a television series in 1996 upon the cancellation of Rocko's Modern Life, and turned to Tom Kenny, who had worked with him on that series, to voice the title character.
Although SpongeBob's driver's license says his birth date is July 14, 1986, which would make the character 12 (nearly 13) years old at the time of his debut appearance on May 1, 1999, Hillenburg joked that he is fifty in sponge years..