Total Water Potential
Compute the total water potential in megapascals as the sum of the osmotic, pressure, and matric potentials; the matric potential defaults to zero and all inputs are signed.
Description
Compute the total water potential in megapascals as the sum of the osmotic, pressure, and matric potentials; the matric potential defaults to zero and all inputs are signed.
Total Water Potential is a focused biology tool that compute the total water potential in megapascals as the sum of the osmotic, pressure, and matric potentials; the matric potential defaults to zero and all inputs are signed. It calculates locally from the values you enter and exposes the result without changing the source observations.1
When to use Total Water Potential
Use Total Water Potential when you need to compute the total water potential in megapascals as the sum of the osmotic, pressure, and matric potentials; the matric potential defaults to zero and all inputs are signed. Enter Osmotic potential, Pressure potential, and Matric potential using the definitions and units below so the result can be reproduced.
- Osmotic potential
- Osmotic potential in megapascals.
- Pressure potential
- Pressure (turgor) potential in megapascals.
- Matric potential
- Matric potential in megapascals; defaults to zero when capillary and surface interactions are ignored.
How Total Water Potential calculates the result
The published tool contract uses this rule: Compute the total water potential in megapascals as the sum of the osmotic, pressure, and matric potentials; the matric potential defaults to zero and all inputs are signed.
- Total water potential
- Total water potential in megapascals; signed.
Limitations of Total Water Potential
The calculation does not propagate measurement uncertainty, sampling error, or biological and chemical variability.
Alternative or Complementary measurements
Retain the original Osmotic potential, Pressure potential, and Matric potential values and their units alongside the result. Pressure Potential is useful when you instead need to compute the pressure (turgor) potential in megapascals as the total water potential minus the osmotic potential; both inputs are signed. CWSI Calculator provides another view by helping you compute the crop water stress index as (canopy temperature - wet reference temperature) / (dry reference temperature - wet reference temperature), clamped to the range zero through one.
References
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Water potential — Wikipedia contributors
Similar or alternative tools
- Pressure Potential
Compute the pressure (turgor) potential in megapascals as the total water potential minus the osmotic potential; both inputs are signed.
- CWSI Calculator
Compute the crop water stress index as (canopy temperature - wet reference temperature) / (dry reference temperature - wet reference temperature), clamped to the range zero through one.
- WUE Calculator
Compute intrinsic water use efficiency as net photosynthesis in micromoles per square metre per second divided by transpiration in millimoles per square metre per second.