Relative humidity is also used to ensure safety for machines, vehicles and buildings. Relative humidity is used for climate control and how it affects human’s health, comfort and safety. Humidity is used to determine the likelihood of rain, fog or mist occurring. Relative humidity is the percentage of water vapor in the air at a given temperature. Humidity is the water content of the mixture of steam and other elements present in the air. Humidity is the amount of water vapor in the atmosphere, and relative humidity is a concept of humidity. The Difference Between Humidity and Relative Humidity In other words, the dew point is the temperature at which the relative humidity of the air mass reaches 100%.ĭew condenses on the leaf 3. (1) The dew point is the dew condensation point of an air mass, at a constant atmospheric pressure, the temperature at which the water vapor content of the air mass condenses into liquid water. Relative humidity can be measured with a hygrometer, called a hygrometer. Therefore, to describe the humidity of air, relative humidity is used. Absolute humidity does not indicate the humidity level of the air because at a lower temperature the more water vapor in the air is saturated. Relative humidity is different from absolute humidity – defined as the mass of water vapor contained in 1 m³ of air. When the relative humidity reaches 100%, the air is already saturated with water vapor and is at the dew point (1). Relative humidity is usually expressed as a percentage (%) The more humid the air, the higher the relative humidity.

The relative humidity ( RH or ϕ) of the water-gas mixture is defined as the ratio between the partial pressure of the steam and the saturated vapor pressure of the water at the same temperature, expressed as a percentage: Specific humidity is the ratio of the mass of water vapor to the total mass of the humid air. Relative humidity indicates the current state of absolute humidity relative to maximum humidity at the same temperature, expressed as a percentage (%). Therefore absolute humidity is often defined in engineering chemistry as the mass of water vapor per unit mass of dry air. This is extremely inconvenient for technical chemistry calculations (e.g for a clothes dryer, since its temperature can vary significantly). However, absolute humidity changes when the air pressure changes.

Humidity has 3 concepts: absolute humidity, relative humidity and specific humidity.Ībsolute humidity describes the water content of gas and is expressed in grams per cubic meter (g/cm³). The higher the humidity, the less effective it is to cool down our bodies, which is why sometimes hot summers don’t make us as uncomfortable as hot humid autumn days.įog in a tropical rainforest (Source: Wikipedia) Humidity indicates the possibility of rain, mist, or fog. The steam, the gaseous state of water, is hard to see with the human eye. Humidity is the concentration of water vapor presenting in the air.

How can we measure moisture and how do we increase or decrease it? This article will help you answer these questions. Have you ever wondered what humidity is that can affect your life so much. Also affects electronics and furniture in the house. Irritating fatigue, too high humidity is also a condition for harmful bacteria and fungi to grow. If the humidity is too high 90%, people will increase the risk of arthritis, cough, asthma, headaches and several other chronic diseases. What is Relative Humidity and Why do we need to measure?įor human life, humidity affects health a lot.

Atomatic dew point measure device