Vapour-pressure deficit the plant may dry out and die. For this reason the ideal range for VPD in a greenhouse is from 0.45 kPa to 1.25 kPa, ideally sitting at around 0.85 kPa. As a general rule, most plants grow well at VPDs of between 0.8 and 0.95 kPa. In ecology, it is the difference between the actual water vapour pressure and the saturation water vapour pressure at a particular temperature. Unlike relative humidity, vapour-pressure deficit has a simple nearly straight-line relationship to the rate of evapotranspiration and other measures of evaporation. To compute the VPD, we need the ambient (greenhouse) air
What the Water Gave Me (song) Music Publishing Group, "What the Water Gave Me" is a pop, pop rock and soul song set in a common time and performed in tempo of 124 beats per minute. It is written in the key of C minor and Welch's vocal range in the song runs from the musical note of A♭ to E♭ "What the Water Gave Me" is five and half minutes long and contains ethereal vocals and harps. A gospel organ and choir along with "trilling" guitars provide instrumentation in "What the Water Gave Me". According to Bill Lamb of About.com, "the song breaks down into