Hi Abhishek,
I think both are same and can be defined as quantity of water contained in a material like soil, rock, ceramics, woods etc.
Good Luck
Water Activity and Moisture Content are two very different parameters which are often confused and misused.
Moisture content is probably the simplest value to understand. It is simply the quantity of water contained in a material. Traditionally measured through loss of weight on drying. This method raises some issues, depending on the drying temperature you may not remove all water or may also remove other non water compounds.
More modern methods resolve these issues and use infra red absorption. This way the water content is directly measured, the method is non-destructive and far quicker.
Moisture content is typically given as a percentage in terms of weight.
Water Activity (aW) is a measure of the free water in a sample, and ranges between 0…1. Pure water would have an aW of 1.0. As water activity measures the ‘free’ or ‘active’ water in a sample it is more relevant to growth of organisms, chemical processes, enzyme activity and physical parameters like size and clumping as these are only effected by the water that can be chemically interacted with. Interestingly Water Activity is related to Moisture Content but it is product and temperature specific.
Moisture content is the total amount of water present in a product.Water activity is the percentage of free water present in a product.The product may contain bound water and free water,The former is a tightly bound water that is not available for microbes and enzymes whereas the latter is the portion available to them
I think both are the same and defined as : Moisture content is the weight of water in a material express as a percentage of the total weight of the material.
W Moisture content, = ……….. X 100 ……………calculated by this formula W+D
- Badges
- Science topic