Sulfuric acid is composed of two hydrogen atoms, one sulfur atom, and four oxygen atoms. It is a type of dangerous acid found in large quantities in Venus's atmosphere. Sulfuric acid can dissolve human cells and cause irreversible damage. It can kill you in less than 1 to 4 hours of direct exposure. Even plastic and aluminum can be turned into liquid by the acid. Only machines made of titanium and some other strong metals survive direct contact with sulfuric acid. This is why we should send machines to Venus, not humans. Link Here.