Moisture is a factor that affects the quality of materials, equipment, and food products, as well as buildings, structures, and machinery in industrial plants. Understanding moisture and how it is measured helps you keep it at the right level, so you can prevent unnecessary damage to your assets.
In this article, we’ll answer the question “What is moisture?”, look at the ways moisture content can be measured, explain the benefits of moisture measurement, and cover other frequently asked questions about moisture.
Table of Contents
- What Is Moisture and Why Is It Important?
- How Can Moisture Be Measured?
- Benefits of Measuring Moisture
- Frequently Asked Questions About Moisture
- Summary: What Is Moisture and Why Does It Matter?
What Is Moisture and Why Is It Important?
Moisture is the amount of water present in a substance. Water is a fundamental part of our planet, found in both living and non-living things, whether as a liquid or as water vapor in the air, so everything around us contains some degree of moisture. Moisture is also one of the key factors that drive chemical reactions in materials. For this reason, controlling moisture content is something every business should take into account to prevent moisture-related damage.
Consider a few examples of how moisture can cause problems. Fried food left out for too long absorbs moisture and loses its crispness, which affects its quality and enjoyment. Metal exposed to high moisture can rust, which can damage metal structures.
How Can Moisture Be Measured?
Now that we know what moisture is, how can we measure the amount present in different materials? Because moisture consists of water particles that can penetrate objects without being visible to the naked eye, scientific techniques are used to measure it, with different units depending on the method. Instruments such as moisture analyzers and moisture meters are commonly used to determine the moisture content of materials.
Today, the most widely used moisture measurement techniques include:
Gravimetric Method: Loss on Drying (LOD)
The gravimetric method is analysis by weight. Loss on Drying measures the moisture content of a sample by weighing it. Since moisture consists of water and other volatile liquids, heating the sample at a suitable temperature for a suitable length of time causes the moisture to evaporate, leaving only the dry matter (the material with no remaining water).
By comparing the sample’s weight before and after the moisture is removed, the moisture content can be calculated.
Karl Fischer Titration
Karl Fischer Titration is another method for determining the water content of a sample. It works for samples ranging from high to very low moisture levels, delivering highly accurate results, and is well suited to moisture analysis in food. The method is based on a titration reaction between an iodine solution and the water in the sample.
Conductivity Measurement
Moisture can also be measured through electrical conductivity. Because water conducts electricity, the more moisture a material contains, the higher its conductivity. Conversely, electrical resistance can be measured instead: the higher a material’s resistance, the lower its moisture content.
TDLAS technology
TDLAS stands for Tunable Diode Laser Absorption Spectroscopy, a technology that analyzes gases and moisture accurately and in real time. It is ideal for measuring moisture in gas samples. A laser diode emits a beam at a specific wavelength through the gas sample, where water vapor molecules absorb part of the light. The resulting change in beam intensity is then used to determine the moisture content.
Benefits of Measuring Moisture
Moisture can damage many kinds of materials. Those that are not moisture-resistant will deteriorate or decay if exposed to excessive moisture over long periods. Setting appropriate moisture levels for products is therefore a key part of quality control and of maximizing product shelf life. Controlling moisture also helps preserve materials inside buildings, from homes all the way up to industrial facilities. Key benefits include:
Home Maintenance
Moisture is one of a home’s worst enemies, damaging structures and materials if left unchecked. Materials at risk of moisture damage include wood, concrete, metal, fabric, and paper.
Product Quality Control
Measuring moisture in food and other products lets you keep them within appropriate standards, whether they are foods, medical supplies, chemicals, or pharmaceuticals.
Other Benefits
Moisture measurement is especially important in industry. Beyond keeping products up to standard, moisture levels can affect safety, transportation, and production processes in many industries. Moisture measurement is also an essential step in weather analysis and forecasting.
Frequently Asked Questions About Moisture
What is the difference between moisture and humidity?
Many people are unsure whether moisture and humidity are different, since Thai uses a single word, “ความชื้น”, for both. In English, moisture refers to the water contained in materials or substances, while humidity refers to water vapor in the air.
What is a moisture balance?
A moisture balance is an instrument that measures moisture content using the gravimetric Loss on Drying method, precisely weighing a sample before and after drying.
Summary: What Is Moisture and Why Does It Matter?
Moisture is the water all around us, whether in the air or within materials. With a correct understanding of what moisture is and why it matters, it becomes clear that proper moisture control is essential in everyday life. From home maintenance to weather analysis and product quality control, all depend on accurate moisture measurement.