They may cover all or part of the body and are usually very itchy. 1  Hives usually break out first on the covered areas of the skin such as the trunk and upper parts of the arms and legs.  Wheals appear in batches. Each wheal may last from a few minutes to six hours.
Early years [edit]. Arrhenius was born on February 19, 1859, at Vik (also spelled Wik or Wijk), near Uppsala, Sweden, the son of Svante Gustav and Carolina Thunberg Arrhenius.oday, Arrhenius is best known for his study published in 1896, on the greenhouse effect.
Arrhenius definition of a base (metal hydroxide) M(OH)n: Is a substance that contains. a metal and hydroxide group (OH -) and produces hydroxide ions (OH -) in the. aqueous solution.Arrhenius base increases the OH-concentration in water.Arrhenius base can be represented by the formula M(OH) n. where M stands.rrhenius defined an acid as any substance that contains hydrogen and when. dissolved in an aqueous solution produces hydrogen ions (protons, H +). and anions. Note: H + (aq.) ion is a proton with no surrounding valence electrons. in water, clusters of hydrated H + ions exist in the form of hydronium. ion (H 3 O +).