water potential is the sum of these following potentials
and the Equation is: Ψ = Ψ0 + Ψπ + Ψp + Ψs + Ψv + Ψm
where Ψ0 is the reference correction, Ψπ is the solute potential, Ψp is the
pressure potential, Ψs is the gravimetric component, Ψv is the potential due to
humidity, and Ψm is the potential due to matrix effects (e.g., fluid cohesion and surface tension.)