Vapour-pressure deficit temperature, the relative humidity and, if possible, the canopy air temperature. We must then compute the saturation pressure. Saturation pressure can be looked up in a psychrometric chart or derived from the Arrhenius equation, a way to compute it directly from temperature is where: To convert between Rankine and degrees Fahrenheit: formula_10 We compute this pressure for both the ambient and canopy temperatures. We then can compute the actual partial pressure of the water vapour in the air by multiplying by the relative humidity [%]: and finally VPD using formula_12 or formula_13 when the canopy temperature is known. Vapour-pressure deficit
The Water Is Wide (song) The Water Is Wide (song) "The Water Is Wide" (also called "O Waly, Waly" or simply "Waly, Waly") is a folk song of Scottish origin, based on lyrics that partly date to the 1600s. It remains popular in the 21st century. Cecil Sharp published the song in "Folk Songs From Somerset" (1906). It is related to Child Ballad 204 (Roud number 87), "Jamie Douglas", which in turn refers to the ostensibly unhappy first marriage of James Douglas, 2nd Marquis of Douglas to Lady Barbara Erskine. The imagery of the lyrics describes the challenges of love: "Love is handsome, love is