The Effect of Temperature on the Surface Tension of Sap of Thuja Plicata Heartwood

A. J. Bolton, G. Koutsianitis


Capillary rise and drop volume methods were applied to the measurement of heartwood sap surface tension. Increase in sap temperature appeared to cause a substantial decrease in surface tension as measured by the former method. Since with the latter method surface tension values only decreased from 58.1 to 56.8 dyne/cm over the temperature range 25 to 80 C, it was concluded that changes in the contact angle of sap on glass were likely to have affected the results obtained by the capillary rise method. The absence of a substantial decrease in sap surface tension with increasing temperature is of considerable relevance to lumber drying.


Sap;surface tension;temperature;contact angle;Thuja plicata

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