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Difference Between Humidity and Moisture

June 23, 2011帖子ed byOlivia

Humidity vs Moisture

People are always confused between the concepts of humidity and moisture as these are closely related concepts. This is because of the use of the word humidity in place of moisture when talking about weather conditions. In daily life, moisture finds many more applications than just weather, and this is what this article will attempt to highlight.

At any point of time, air in the atmosphere contains some amount of water vapor. The percentage of water vapor in the air compared to the maximum water vapor that air can hold at any given temperature is known as the humidity of air. More the humidity, more one feels stickiness in the air, which is because of the moisture present in air. At any given temperature, air has a specific capacity to hold moisture. When moisture content in air surpasses this value, excess moisture spills out in the form of precipitation. However, precipitation can take place by lowering the capacity of water retention by lowering temperatures also.

So, if moisture in air is half of the capacity of air to hold water, the relative humidity is 50% and if it goes up to 3/4th of the capacity of air, we call it as 75% relative humidity. Water content remaining constant, relative humidity goes up or down with variations in temperatures. Increasing temperature will lower the relative humidity while decreasing temperatures will increase relative humidity. The best example of this concept in daily life is the presence of dew on grass in your lawn in the morning. At night, temperatures go down causing relative humidity to go up making excess water present in air to spill over in the form of condensation that is seen as dew on grass and the wind shield of your car.

There is another thing that baffles people and it is the distress or feeling of discomfort with increasing humidity. Let it be clear that both temperatures and humidity are responsible for the feeling of discomfort. If temperature goes down bringing relative humidity to high levels, we start feeling discomfort despite air being cooler which confuses many. Again, temperature being in the vicinity of forty degree Celsius may not feel uncomfortable. This is because humidity levels may be too low. In mornings in summers, temperatures are down but we do not feel cooler because of high humidity and do not complain in the afternoon as well because humidity goes down even though temperatures have gone up. It is only when both humidity and temperatures are up that we feel uncomfortable.

There is a natural defense system of our bodies that keeps us cool when temperatures go up. Hypothalamus in brain sends signals to millions of sweat glands and they begin to produce sweat. This sweat, when it evaporates lowers the temperature of our body offsetting the rise in temperature outside. However, it is when relative humidity is high that this sweat is not able to evaporate, and we feel sticky and uncomfortable.

简而言之:

Difference Between Humidity and Moisture

• Air in the atmosphere contains water vapor at any point of time and it is this moisture content that is referred to as humidity

• Air has a particular capacity of water retention at any given temperature and when this level is breached, water spills over in the form of precipitation

• However, humidity or moisture can be lowered by rise in temperature. On the other hand, humidity increase when temperature goes down which is seen in the form of morning dew.

Related posts:

Difference Between Temperature and Humidity Difference Between Converter and Inverter Difference Between Ounce and Troy Ounce Difference Between Evaporation and Transpiration Difference Between Resistance and Resistivity

Filed Under:PhysicsTagged With:dew,humidity,humidity of air,Hypothalamus,moisture,moisture in air,morning dew,precipitation,relative humidity,sweat,sweating,Weather

About the Author:Olivia

Olivia is a Graduate in Electronic Engineering with HR, Training & Development background and has over 15 years of field experience.

Comments

  1. C Ksays

    May 22, 2015 at 8:04 pm

    我运行一个排球。和sometimes our courts will get slick. We have two Big Ass 24 ft fans and 6 smaller fans. We also have an industrial size air exchange as our place is over 36000 square feet. What are your suggestions for keeping our courts dry.
    Last week there was a lot of moisture in the air , it had rained a lot the day before and then the temp rose to 81. we had the air exchange going. Which now that we think about it was just exchanging outside air with moisture with inside moisture air. I had people tell me to run off the air exchange, people tell me to keep it on. Someone told me to turn in the heat. And even thou we don’t have air condition I was told to turn it on. I gues I’m just looking for the best way to keep our courts dry when we have 8 courts going and 500 people in our place. Should the fans run all the time? Should they run also the night before? Or should we have turned on the heat?

    Reply

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