CSC Scientific Blog

A blog about test equipment

CSC Scientific Blog

How Long Does a Water Activity Test Take?

Posted by Amanda Ranowsky on Jul 27, 2017 8:00:00 AM

The answer to the question, “How Long Does a Water Activity Test Take?” is, as with most testing questions, “it depends.” Some water activity meters promise a test completed in a very short time; some in as little as five minutes. This time is an arbitrary selection that may or may not produce a satisfactory result.

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Topics: Bound Moisture, Free Moisture, Moisture Analysis, Water Activity, Moisture, water activity measurement

How Wide Is The Moisture Measurement World?

Posted by Art Gatenby on May 13, 2014 6:26:00 PM

At one end of the spectrum of the moisture world is the classic Speedy Moisture Tester where you use the reaction of water with calcium carbide to cause a mini explosion resulting in a moisture measurement reading. This method is used frequently for soils, concrete, and other like materials.

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Topics: Moisture Sorption Isotherm, Moisture Analysis, Water Activity, Karl Fischer, Loss-On-Drying

Moisture Content and Water Activity - What Are They?

Posted by Art Gatenby on May 30, 2013 1:23:00 PM

Many accessing our web site ask questions such as:

  • “How does water content affect water activity?”

  • "How is water activity different from water content?”

  • ”Can I convert from moisture to water activity?”

I previously commented on water activity and now hope to clarify the differences between water activity and moisture content. Given that both of these measurements deal with water connected to a material, we must first understand of water content in a product.

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Topics: Moisture Sorption Isotherm, Moisture Analysis, Water Activity, moisture content, moisture measurement, water activity measurement, water content measurement

What is Moisture Content?

Posted by Art Gatenby on May 29, 2012 3:24:00 PM

Last week, as I was reflecting on a recent moisture content problem, I recalled our series “Loss-on Drying and Other Moisture Mysteries.” In that series I examined moisture chemistry in products. However, I did little to define moisture content.

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Topics: Bound Moisture, Free Moisture, Moisture Analysis, Water Activity, Moisture Testing, Karl Fischer, Karl Fischer Titration, Moisture

Moisture Content - Water Activity – Are They the Same Thing?

Posted by Art Gatenby on Mar 6, 2012 4:19:00 PM

The other day, I woke up with a lingering quandary: Are the concepts of

Moisture Content and Water Activity the same thing?

As usual, I’ve decided to take on the task of clarifying the difference.  I hope I pull it off.

From the perspective of someone who supplies instruments that measure moisture content, water activity has not been a primary consideration.  However, I believe that comparison and contrast of these important concepts will be useful.

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Topics: Moisture Sorption Isotherm, Infrared Moisture, Moisture Analysis, Water Activity, Moisture Testing

Loss-On-Drying Moisture Analysis and Other Moisture Mysteries Part IV: Water Activity

Posted by Art Gatenby on Mar 31, 2011 3:39:00 PM

Loss-On-Drying moisture analysis seemed like a simple process until, in a state of naïve bliss, I promised to look at evaporation, vapor pressure and bound water. While I was otherwise occupied with these realities, I offered to enter the world of witchcraft and folklore; water activity.

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Topics: Bound Moisture, Moisture Sorption Isotherm, Moisture Analysis, Water Activity, Loss-On-Drying

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