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What is Moisture Content?

By Jen Ainoa
Updated May 21, 2024
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Moisture content is a measure of the amount of water or water vapor contained within a substance. It can be helpful to think of it as the percent by mass of water in a sample of a mixture or form of matter. This measurement is a variable factor for most substances and can change with weather and temperature.

Knowing the amount of water or moisture content of a substance can help someone determine if that substance is suitable for a specific use. For example, the amount of moisture in soil directly influences the types of organisms that can live in it. The water content in the soil can be measured with probes that attach to hand-held computers. When the probe is inserted into the soil and activated, it can provide an instant reading.

In the agricultural processing of foods such as coffee or cocoa beans, knowing the moisture content is key to determining when it is safe to package and ship the product. If coffee or cocoa beans have too much moisture, they will mold when packaged and will not be safe to consume. Conversely, if the level is too low, coffee and cocoa lose some flavor.

Establishing the ideal moisture content of a substance for a commercial purpose takes some trial and error. Often, as in the case of coffee and cocoa beans, simple techniques may be the most effective in attaining the ideal level. The sun, simple drying racks, and time are factors that may be utilized to reduce the moisture in many food products.

The term for lowering moisture content in a substance is dehydration. Dehydration can turn an otherwise juicy fruit or vegetable into a little, dry, shriveled model of its former self. Many mushrooms and fungus are sold in a dehydrated form in which nearly all moisture has been removed. When these mushrooms are soaked in water, which is called rehydration, they are very similar in taste, texture and appearance to the fresh versions.

Carpenters know the importance of moisture content as it relates to wood. Green wood, or wood that was very recently a standing tree, has a high moisture level and is not suitable for building material. Using such wood can cause bowing, buckling, and even the formation of large cracks once the moisture begins to evaporate. On the other hand, rehydrating wood by soaking it can allow it to be bent to create specific shapes. This is useful when constructing wood products that need to be curved, such as guitars. Determining and controlling the moisture in substances is unique and necessary for many products, and the process borders between art and science.

All The Science is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Discussion Comments
By anon297957 — On Oct 17, 2012

Now I really understand why the moisture content is important to foods. Thanks!

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