All that’s left is to figure out how to use this information in your own grow. So now you know what VPD is, how it impacts plants, and how you can change VPD. Similarly, the current actual amount of water vapor in the air is called the “actual vapor pressure” or AVP. The air just gets too full of water, and the water condenses out. That is why there is dew all over everything after a cool morning. As air cools down, the SVP decreases, meaning that the air can’t hold as much water vapor. The maximum amount of water vapor that air can hold at a certain temperature is called “saturation vapor pressure” or SVP.Īs the air gets hotter, the amount of water that the air can hold (its SVP) increases. The amount of water vapor in the air (expressed as pressure) is called “vapor pressure”.Īir can only hold a certain amount of water vapor at a given temperature before it starts condensing back to liquid water (in forms such as dew or rain). Water vapor, the gaseous form of water, is one of those other gases. Air is about 78% nitrogen, 21% oxygen, and much smaller parts of other gases. VPD stands for Vapor Pressure Deficit, but what does it actually mean?Īir is made up of many gasses.
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