http://www.ptable.com
http://www.uigi.com/air.html
https://en.wikipedia.org/wiki/Density_of_air
http://hypertextbook.com/facts/2001/JudyMoy.shtml
http://www.chemistry.wustl.edu/~edudev/LabTutorials/Water/FreshWater/acidrain.html
https://www.britannica.com/science/acid-rain/Chemistry-of-acid-deposition
http://www.kwanga.net/chemnotes/chem-acid-rain-info.pdf
http://web.pdx.edu/~wamserc/CH399S97/Notes6.htm
https://www3.epa.gov/acidrain/education/site_students/phscale.html
http://ibchem.com/IB/ibnotes/08.3.htm
http://www.bob-r.com/ENI/H2SO4%20Dissociation.pdf
https://www.ucc.ie/academic/chem/dolchem/html/comp/h2so4.html
http://antoine.frostburg.edu/chem/senese/101/acidbase/faq/what-is-pH.shtml
https://www.boundless.com/chemistry/textbooks/boundless-chemistry-textbook/acids-and-bases-15/strength-of-acids-109/calculating-percent-dissociation-458-7521/
http://www.uigi.com/air.html
https://en.wikipedia.org/wiki/Density_of_air
http://hypertextbook.com/facts/2001/JudyMoy.shtml
http://www.chemistry.wustl.edu/~edudev/LabTutorials/Water/FreshWater/acidrain.html
https://www.britannica.com/science/acid-rain/Chemistry-of-acid-deposition
http://www.kwanga.net/chemnotes/chem-acid-rain-info.pdf
http://web.pdx.edu/~wamserc/CH399S97/Notes6.htm
https://www3.epa.gov/acidrain/education/site_students/phscale.html
http://ibchem.com/IB/ibnotes/08.3.htm
http://www.bob-r.com/ENI/H2SO4%20Dissociation.pdf
https://www.ucc.ie/academic/chem/dolchem/html/comp/h2so4.html
http://antoine.frostburg.edu/chem/senese/101/acidbase/faq/what-is-pH.shtml
https://www.boundless.com/chemistry/textbooks/boundless-chemistry-textbook/acids-and-bases-15/strength-of-acids-109/calculating-percent-dissociation-458-7521/