Air and leaf VPD
Explore temperature and humidity with numbers and an interactive table.
Inputs
- Air VPD
- 1.11 kPa
- Leaf VPD
- — kPa
Sent only with your enquiry. The original CSV is not attached.
Explore air VPD
Select a cell to use its temperature and humidity in the active scenario. · Scenario A
| °C / RH | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|
| 18 °C | ||||||
| 20 °C | ||||||
| 22 °C | ||||||
| 24 °C | ||||||
| 26 °C | ||||||
| 28 °C | ||||||
| 30 °C | ||||||
| 32 °C |
Saturation vapour pressure uses the Tetens equation over water between −20 and 60 °C. Leaf VPD requires measured leaf temperature. Table colours indicate air VPD magnitude only; they do not prescribe crop conditions.
How we calculate
eₛ(T) = 0.6108 × exp(17.27T / (T + 237.3)); VPDair = eₛ(Tair) × (1 − RH/100); VPDleaf = eₛ(Tleaf) − eₛ(Tair) × RH/100 [kPa]Method source ↗