What this calculator does
Plant water potential works out total water potential from solute and pressure potential in a plant cell. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaΨs = −iCRT (R = 0.008314 L·MPa/(mol·K)); Ψ = Ψs + Ψp
The inputs explained
| Field | What to enter |
|---|---|
| Ionization constant i | A number. Starts at 1. |
| Solute concentration (mol/L) | A number, measured in mol/L. Starts at 0.3. |
| Temperature (°C) | A number, measured in °C. Starts at 25. |
| Pressure potential Ψp (MPa) | A number, measured in MPa. Starts at 0. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with ionization constant i
Every other input is held at the calculator’s starting values while ionization constant i varies. Select any row to load that scenario into the calculator.