The students will construct and use a sling psychrometer to determine relative humidity. Safety goggles are required for this activity in my classroom while the psychrometers are being constructed and used. Students will take measurements of the temperature on each of the two thermometers, determine the difference between the two readings, and use a table to determine relative humidity. Students may need to review how to read a thermometer. The students should find two thermometers that have the same room temperature reading before constructing their sling psychrometer.
Safety is probably the biggest concern with students.
I require safety goggles for the construction and use of sling psychrometers. Their sling psychrometer should have to pass instructor approval before they try it out. Students need to be reminded to record the changes in temperature after the psychrometer has been spun. Having the class decide on ten or twenty spins might be a good idea. Two thermometers mounted on metal backs.