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In this investigation, students use a a homemade psychrometer to measure relative humidity Two metal thermometers, a small piece of cloth, string, and a timer are required materials. The resource includes a chart which students use to calculate relative humidity from wet and dry bulb temperatures. The resource is part of the teacher's guide accompanying the video, NASA SCI Files: The Case of the Phenomenal Weather. Lesson objectives supported by the video, additional resources, teaching tips and an answer sheet are included in the teacher's guide.
This resource is located on page 35 of the PDF document.