relative humidity la gi

The basics
Put simply, relative humidity (RH) is a measure of the water vapor nội dung of air. More explicitly, it is the amount of water vapor present in air expressed as a percentage (%RH) of the amount needed lớn achieve saturation at the same temperature.

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RH is strongly proportional lớn temperature and highly sensitive lớn temperature changes. This means that if you have a stable temperature in your system, your RH will also be stable. As well as temperature, relative humidity also depends on the pressure of the system in question.

Some helpful rules of thumb
There are some helpful rules of thumb lớn help us understand how RH works at a basic level, though it’s important lớn remember that unless you’re in a closed system such as an environmental test chamber, other factors can affect results.

The first rule of thumb is that as temperature increases, air becomes drier (RH decreases) and as temperature decreases, air becomes wetter (RH increases). When thinking about pressure, the rule of thumb is that as pressure decreases, air becomes drier (RH decreases) and as pressure increases, air becomes wetter (RH increases).

Why is it important lớn monitor relative humidity?
By far the biggest reason lớn monitor relative humidity is lớn control moisture around a final product. In most cases this means making sure that the RH never rises too high. For example, let’s take a product lượt thích chocolate. If the RH in a storage facility rises above a certain level and remains above that level for a sufficiently long period of time, a phenomenon called blooming can occur. This is where moisture forms on the surface of the chocolate, dissolving the sugar. When the moisture evaporates, the sugar forms larger crystals, leading lớn discoloration.

Humidity can also have a harsh – and expensive – impact on products such as building materials. Say you’re building an extension lớn your property and you rung rinh a concrete subfloor before putting down hardwood flooring. If the concrete isn’t sufficiently dry before you rung rinh the floor it can cause huge problems because any moisture from the concrete will naturally try lớn migrate lớn a drier area – in this case the flooring material. This can cause the floor lớn swell, blister, or crack – undoing all your hard work and leaving no option except replacement.

Humidity is also a big problem for products with extreme sensitivity lớn moisture, such as certain pharmaceuticals. This is because it can alter the characteristics of the product until it becomes useless, which is why products lượt thích medical pills and dry powders are stored in controlled conditions at precise humidity and temperature levels.

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Finally, relative humidity is also an important factor in building automation systems focused on human comfort, such as air conditioning. The ability lớn measure and control RH not only helps lớn maintain a comfortable environment inside a building, but it also helps lớn optimize the efficiency of HVAC systems by providing an indication of how much outside air being taken in needs lớn be conditioned, depending on the temperature outside.

Want lớn learn more? Download our Humidity eGuide for Smart Industries lớn get a handy package with links lớn a humidity calculator, drying simulation, webinars and other information.

Vaisala HUMICAP® Humidity and Temperature Probe HMP4 is designed for high-pressure applications such as compressed air systems in maritime, breathing air, and industrial applications, where measurement performance and chemical tolerance are essential.

Vaisala HUMICAP® Humidity and Temperature Probe HMP5 is designed for high temperature applications such as baking ovens, pasta dryers, ceramics and industrial drying kilns where measurement performance and chemical tolerance are essential.

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Vaisala HUMICAP® Humidity and Temperature Probe HMP7 is designed for applications which involve constant high humidity or rapid changes in humidity

Vaisala HUMICAP® Humidity and Temperature Probe HMP8 is designed for pressurized applications in compressed air systems, refrigerant dryers, and other pressurized industrial applications where easy insertion and removal of the probe and adjustable installation depth into the pipeline are needed.