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While students may not realize the effects of dew point and relative humidity, these two factors often determine the way in which we characterize weather (humid, dry, etc.).

This lab, developed by earth science teacher Susan Hoeffner, is unique because it allows students to compare Celsius and Fahrenheit dew point and relative humidity readings by performing six separate labs (three each using the Celsius and Fahrenheit scales).

After measuring the dew point, students, working in groups of three, can use a sling psychrometer to obtain wet- and dry-bulb temperature readings and determine the dew point temperature and relative humidity. The psychrometer is newly designed so that the thermometer stays securely attached. Grades 7-10.

Includes: ten sling psychrometers, metal-backed thermometers and metal cans, hygrometrical table, relative humidity charts (°C and °F), depression wet-bulb table and complete instructions containing lab activities.


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