The pH of a solution indicates the concentration of free H+ ions in solution on a negative log base 10 scale. Low pH (acidic) means high H+ concentration High pH (basic) means low H+ concentration.
Mistakes. 1  In the manga, Ravenpaw is shown with a slightly altered appearance from his description in the books. 2  He has been mistakenly called Ravepaw. 3  He was mistakenly mentioned with blue eyes.  He is mistakenly called a rogue by Sandstorm in A Clan in 1  Need. He is mistakenly called 'Ravenclaw' by Vicky.
Courtesy of WDFW.) Ravens differ from crows in appearance by their larger bill, tail shape, flight pattern and by their large size. Ravens are as big as Red-tailed Hawks, and crows are about the size of pigeons. The raven is all black, has a 3.5-4 ft wingspan and is around 24-27 inches from head to tail. The crow is also black, has a 2.5 ft wingspan and is about 17 inches long.