CSC Scientific Blog

A blog about test equipment

Art Gatenby

Manufacturer of test equipment. The Company specialized in the measurement of Moisture, Particle Size and Surface Tension. In these areas CSC Scientific serves the Food, Chemical, Pharmaceutical, Petroleum, Waste Water, Mining, Power and similar industries.
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Recent Posts

Moisture Content and Water Activity - What Are They?

Posted by Art Gatenby on Nov 11, 2021 5:04:31 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

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

Posted by Art Gatenby on Nov 11, 2021 3:27:32 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 hese 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

Can You Define Viscosity Without Feeling Thick?

Posted by Art Gatenby on Oct 5, 2021 4:43:00 PM

Do an internet search for the term “viscosity”, and you’ll find a variety of definitions for the word. For example:

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Topics: Viscometers, Viscosity

Why Test for Viscosity in Food

Posted by Art Gatenby on Sep 30, 2021 4:35:00 PM

When people hear of viscosity for the first time, invariably they ask these three questions:

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Topics: Newtonian Fluid, Measure Viscosity, Viscometers, Viscosity, Viscosity in Food

How I Learned That Black Liquor Was Not Dark Rum

Posted by Art Gatenby on Sep 28, 2021 12:28:35 PM

When our customers tell me about the different places where CENCO and CSC Digital Moisture balances are used it always interests me.

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Topics: Moisture Analysis, Moisture Testing, Loss-On-Drying, Moisture, moisture content, water content measurement

Coulometric/ Volumetric Karl Fischer Titration -- Which Should I Use?

Posted by Art Gatenby on Sep 23, 2021 12:53:41 PM

As usual when we pose a question, like:

Should you use Coulometric or Volumetric Karl Fischer to measure moisture in your product?

We often get a the reaction, “So Who Cares?” We'll try to answer both questions.

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Topics: Coulometric Karl Fischer, Volumetric Karl Fischer, Moisture Analysis, Moisture Testing, Karl Fischer, Karl Fischer Titration

Water Activity Measurement and the Illusion of Quick and Accurate

Posted by Art Gatenby on Aug 17, 2021 2:00:38 PM

Water Activity

Water activity is the water in a material available to support the growth of microorganisms.  Consequently, the measurement of water activity is important in areas such as food processing, pharmaceutical production, products affected by mold, and a host of products that change characteristics when exposed to moisture.

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Topics: Water Activity, stop mold, chilled mirror, aw

Mixing It Up Inside A Karl Fischer

Posted by Art Gatenby on Jul 7, 2021 5:46:23 PM

 When people are looking for a way to measure small amounts of moisture, we often recommend the Karl Fischer method.

What is Karl Fischer?

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Topics: Karl Fischer, Karl Fischer Titration

Moisture Test Results Don't Always Measure Moisture

Posted by Art Gatenby on Jun 29, 2021 7:00:00 AM

The most popular was to measure include:

  1. Drying the material and measure the weight loss 
  2. Using a calibration and electronic instrument 
  3. Using a titration method such as Karl Fischer

When using these processes, we take for granted that the results will be the product's actual moisture.

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Topics: Evaporation, Moisture Oven Test, Infrared Moisture, Moisture Analysis, Moisture Testing, Karl Fischer Titration, Loss-On-Drying, evaporator oven

Liquid Surface Tension and Interfacial Tension Between Liquids

Posted by Art Gatenby on Jun 24, 2021 3:34:00 PM

I was musing, the other day on the designs of two ring tensiometers. One of them is called an interfacial tensiometer and the other simply a tensiometer. The plain tensiometer works only with an upward pull and the interfacial works with both an upward pull as well as a downward push. Before I get to my question a couple of definition might be useful.

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Topics: Surface Tension Measurement, Surface Tension, interfacial tension, interfacial surface tension, surface Tension Testing, du Nouy Ring Method, du Nouy tensiometer, Liquid Properties

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