Answer:

moisture

AnswerCrossword Clue
MOISTUREDampness
MOISTUREDefogging target
MOISTURECellophane keeps it out
MOISTUREDefogger's target
MOISTUREWhat humidity measures
MOISTUREDew, for example
MOISTUREDehumidifier's target
MOISTUREHumidity.
MOISTURECause of mildew.
MOISTUREDampness.
MOISTUREWhat the Gobi needs
MOISTURECause of dampness
MOISTUREDew
MOISTUREDew, e.g.
MOISTUREHumidity
MOISTUREWhat hygroscopic surfaces attract