This Celtic symbol of everlasting love is formed from two triskeles. The triskeles, three cornered knots, denote the three aspects of two people, body, mind and spirit. The two triskeles, joined together, show a circle, the everlasting circle of eternity.
All the others are weak acids. A strong acid is one that dissociates completely when it dissolves in water. Dissociate means that the substance splits apart into ions. There are only a few strong acids in water, they are: HBr, HCl, HI, HNO3, HClO4 and H2SO4 (for the first H only) All other acids are weak acids. Chemists use the term strong or weak with regard to acids and bases to tell how much the substance dissociates in water.
We all have certain notions about solvent strength. Acetone is a strong but rapidly evaporating solvent. Water is weak and not really a solvent at all. Petroleum benzine, VM&P naphtha, etc. are weak or very mild solvents. All of these statements miss the point. A solvent is strong or weak relative to the material being dissolved (and relative to the material we do not want to dissolve). This concept is crucial to the safe exploitation of solvents in conservation.