A hygrometer consisting of a wet-bulb and a dry-bulb thermometer, the difference in the two thermometer readings being used to determine atmospheric humidity.
- Late in the dry season, soil water potential was measured in the interspaces, and beneath the projected canopies of D. articulata and Maytenus boaria, with dewpoint-mode thermocouple psychrometers.
- Two fresh leaf discs were punched from the centre of each blade, and the water potential of the discs was measured using a thermocouple psychrometer (Wescor, Logan, UT, USA).
- Room temperature and air humidity were recorded with an Assman psychrometer.
Early 18th century: from Greek psukhros 'cold' + -meter.
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