The warmth of the air in the experiment conducted by Kate is the dependent variable.
What is dependent variable?
In an experiment, the dependent variable is the variable that is measured or recorded by the experimenter.
On the other hand, the independent variable is the variable that is manipulated or changed by the experimenter.
According to this question, Kate gathered three boxes of the same size made of different materials: glass, clear plastic, and aluminum painted black. She placed them on a window sill in the sun for an hour and then measured the warmth of the air in each box.
This suggests that the warmth of the air in the experiment conducted by Kate is the dependent variable.
Learn more about dependent variable at:https://brainly.com/question/1479694
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