yasya tac chrotram ucyate
yasya tat sparsanam viduh
nabhah-guna-visesah-the distinctive characteristic of sky (sound); arthah-object of perception; yasya-whose; tat-that; srotram-the auditory sense; ucyate-is called; vayoh guna-visesah-the distinctive characteristic of air (touch); arthah-object of perception; yasya-whose; tat-that; sparsanam-the tactile sense; viduh-they know.