title: Precipitation: its acidic nature.
abstract: A comparison of the free hydrogen ion concentration and the total hydrogen ion concentration of rain samples shows that rain is a weak acid. The weak acid nature of rain casts doubt on the concepts that the acidity of rain is increasing and that these increases are due to strong acids such as sulfuric acid.
authors.forename: J O
authors.initials: JO
authors.lastname: Frohliger
authors.forename: R
authors.initials: R
authors.lastname: Kane