Abstract
In this investigation the temperature of a water surface was measured by two techniques, one utilizing a commercial infrared radiometer and the other, thermistor probes. Both methods were shown to be satisfactory for following changes in surface temperature during evaporation studies; however, the radiometer used was less sensitive to changes in temperature than the thermistors, being limited to changes in temperature of 0.1°C. or greater. The radiometer does have the advantage of measuring the temperature of a much thinner layer of water than the thermistor, 0.1 mm. as compared to 2 or 3 mm. It also responds more rapidly to changes in water temperature than the thermistor and can be operated at some distance from the water surface. It was shown during this study that the presence of a monomolecular film will not significantly alter the emissivity of a water surface, within the limit of sensitivity of the radiometer. Any change in apparent temperature detected by the radiometer when a monolayer is spread at the interface must, therefore, be due to changes in the real temperature of the water surface. Such changes could result from the monolayer's influence on the rate of evaporation or on movement of surface water.
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