EnvThes
type: ConceptScheme

deprecated concept
type: Concept

vapor pressure deficit
type: Concept
deprecated: true
alternative label: VPD
broader: deprecated concept
definition: The difference (deficit) between the amount of moisture in the air and how much moisture the air can hold when it is saturated. Once air becomes saturated water will condense out to form clouds, dew or films of water over leaves.
in scheme: EnvThes