CSC Scientific Posts Answers to the Question "What are the Differences Between Moisture Content and Water Activity?"

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CSC Scientific has been a resource for solving moisture determination problems for more than five decades. In addition to answering direct inquires, the company regularly publishes information about many aspects of the subject moisture testing including Moisture Content and Water Activity.

Water Activity Test

Water Activity Test Concept

The only thing common to water activity and moisture content is water.

Moisture content in a product is a simple concept. However, moisture, i.e. water is pervasive. It gets into the very structure of a material. Consequently, it is often difficult to determine moisture content. Often a myriad of different techniques is required.

CSC Scientific deals with these complexities by offering products that cover a wide range of moisture determination methods. These products include Loss-On Drying techniques, Karl Fischer Titration, Infred analysis and electrical reactivity.

One of the issues with moisture in a product is the ability or tendency to release moisture into the atmosphere. In the case of packaged food this moisture can react with bacteria or mold to create spoilage. This tendency is known as water activity.

At CSC, we get frequent questions about the relationship of water activity to moisture content. These questions range from; “Are they the same thing?” to “Can you determine Water Activity if you know Moisture Continent?”

To help answer these questions, CSC has just published an article “Moisture Content and Water Activity - What Are They?." This article provides a summary of the characteristics of each measurement and identification way to translate a measurement of moisture content to a value of Water Activity.

The moisture measurement techniques offered by CSC Scientific are delineated on the Moisture Page.

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Art Gatenby
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