vaccine, 1585 vacuum phototube, 1586 vacuum system in mass spectrometry , 1586 valence, 1586 valence band, 1586 valence isomer, 1587 valence tautomerization, 1587 valence transition, 1587 value of a division of a precision balance scale , 1588 value of a quantity , 1588 van der Waals adsorption, 1588 van der Waals forces, 1588 vaporization temperature, in electrothermal atomization , 1588vapour phase interference in analysis , 1589 variable, , 1589 variable pathlength cell in spectrochemical analysis, 1589 variance , , 1589 variational transition state theory, 1590