Is there a connection between rot and moisture? Why does something (eg wood) rot faster when wet?

Answer

Dear Philip,

Decay is the process in which material (such as wood) is attacked by micro-organisms that are present in the environment. Microorganisms, including bacteria, yeasts and fungi, use the organic compounds in the material as a source of nutrition. However, these nutrients can only be absorbed by the microorganism if there is sufficient moisture present. If the micro-organisms present can absorb nutrients thanks to the water, these micro-organisms feel good and they can start to multiply (especially if the ambient temperature is warm enough), so that the number of micro-organisms can increase significantly. and the decay process is thus accelerated. Hence dry wood does not rot, but in the presence of water it does. This is the same explanation why dry foods (such as milk powder, cocoa powder, …) can be stored for a long time, but as soon as water gets in them (for example condensation water from the fridge or moisture from the environment) these products start to spoil in the short term. due to the bacteria and fungi present, which thanks to the water can now absorb the nutrients and start to multiply.