This is why cord blood can be used for transplantation as an alternative to bone marrow. Cord blood is being used increasingly on an experimental basis as a source of stem cells, as an alternative to bone marrow. Most cord blood transplants have been performed in patients with blood and immune system diseases.
(= (S + (p. . Solute potential is at a maximum at zero (distilled water), whereas pressure potential can be negative (vacuum), zero (one atmosphere), or positive (greater than zero). So distilled water at normal atmospheric pressure has a water potential of zero ((= 0).
Pressure and stress have the same units: pounds per square inch (psi) or newtons per square meter (N/m^2) also known as pascal (Pa). Pressure is a force per unit area typically used inside a fluid (liquid or gas) and is the same in all directions at a point inside the fluid. Stress is also force per unit area but is typically used inside solids. The difference is that the stress can be different in different directions inside the solid.