Meteorology and Weather
Percentages, Fractions, and Decimal Values

# Is relative humidity usually expressed as a percent?

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###### 2016-06-15 17:28:50

Yes. It is the percentage of the maximum water vapor content for a given temperature.

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## Related Questions

It is expressed as a percentage (fraction of 100%).

Water vapor in the air is absolute humidity. The ratio of the absolute humidity to the maximum absolute humidity for that temperature and pressure is called the "relative humidity." Absolute humidity is very frequently expressed in terms of grains per pound of air, ppm, or vapour pressure. Relative humidity is usually expressed as a percent.Relative humidity, expressed as a percentage from 0% to 100%, is the amount of moisture in air divided by the total possible amount of moisture in air. Unfortunately, the total possible amount changes when the temperature changes, so the relative humidity can change without adding or removing any water.Another measure is dew point, which is the temperature at which water would condense. It doesn't change with temperature.The lowest measured relative humidity in Phoenix, AZ, USA, is 2%--pretty dry. Sometimes the dew point is below 0 degrees, also pretty dry. (Celsius or Fahrenheit? Both!)

Since it's usually snowing, the relative humidity is near 100%.

False, a decrease in temperature results in an increase of relative humidity

Percent composition is usually expressed as a percent by mass, but in the case of gases and vapors, it is often expressed as a percent by volume.

Humidity is the amount of water vapor in the air. Humidity is usually expressed as a percentage of the maximum that the air could hold at that temperature.

Relative humidity is normally at a minimum just before the dawn of morning. This is usually the lowest temperature of the day, as well.

The term is humidity.It is usually expresed as "relative humidity" which is the comparison between the amount in the air and the maximum that it can hold at a given temperature.Humidity

There are several ways of measuring humidity: Absolute humidity is measured in [ML-3] usually grams per cubic metre. Relative humidity and specific humidity are both pure ratios and so have no units.

7.75 percent is usually expressed as .0775 775/10000 is the fraction

There aren't many. Relative humidity isn't usually of much interest to serious meteorologist. Stations report dewpoint; calculating RH is another step. Intellicast.com (see link) has national RH maps. I usually get my humidity information from dewpoint maps from weather.unisys.com. Contour plots of dewpoint (related link) are among of the most useful.

It depends on what you mean. A dew point of 60 degrees Fahrenheit would be considered moderate to high humidity. A relative humidity of 60% would usually be considered low at low temperatures and high at high temperatures.

Different types of humidity (specific, relative, and vapor pressure) are all measured with different units, although weathermen usually express the relative, which is measured as a percentage. For further help, I've attached a link in the related links below.

75 degrees F OK that's fine for temperature but what is the ideal room humidity percentage? Actually, most building codes only require you at keep the temperature at 68 degrees, which is ideal. The ideal room humidity percentage is usually around 50% ASHRAE Standards: 68-74F @40-60% relative humidity in the Winter 73-79F @40-60% relative humidity in the Summer

Humidity can be defined in different ways, but humidity simply means the amount of water vapor present in the air:Absolute humidity is the mass of water vapor in the unit volume of air. Its SI units are g/m3, but any mass per volume unit could be used.Relative humidity is the ratio of the absolute humidity to the maximum absolute humidity for that temperature and pressure. It is expressed as a percentage. It is of limited utility in weather reporting, despite its unfortunate ubiquity, because it depends on both air temperature and vapor content and therefore changes when either or both of these terms change.Dew point temperature is the temperature at which water vapor would condense if the air were cooled to it. Being a temperature, it is expressed as F, C, or K.Specific humidity is similar to absolute humidity, though you rarely see this in everyday life. It is the ratio of water vapor to dry air, both in terms of mass (whereas absolute humidity is mass/volume). It is usually expressed as kg/kg, which is the SI unit.Mixing ratio is similar to specific humidity and can be approximated by this term. It is a dimensionless ratio of water vapor to dry air and is often used in operational meteorology to diagnose certain meteorological quantities throughout the atmospheric column relative to the vapor pressure and saturation vapor pressure of the air. ----- The lowest measured relative humidity in Phoenix, AZ, USA, is 2%--pretty dry. Sometimes the dew point is below 0 degrees, also pretty dry. (Celsius or Fahrenheit? Both!)

difference between dry bulb temperature and wet bulb temperature which is usually different from each other...like WBT is always less than DBT!! But at 100% relative humidity both are same!!..

Relative humidity is higher as the temperature approaches the dew point, meaning usually it will be most humid right before dawn (at night typically, but also early in the morning). Think about when you're most likely to see fog and that's when it's most humid.

"its not the heat , its the humidity" usually means it is the the humidity that cools your body temperature down .

I really don't think that's the convention for these regions - I think most places usually mention relative humidity. Dew point tends to be a more useful metric, especially for comfort in the summer.

Humidity is the actual amount of moisture in a certain volume of air.Relative humidity is the percentage of the maximum amount of moisture that's possible in certain volume of air for a particular temperature.Example of Relative Humidity: Suppose a 5 ft. cube of air could could hold a maximum 10 oz. of moisture at 80 degrees. Now suppose that the cube of air actually contains 5 oz. of moisture. The Relative Humidity would be 50%.The idea of humidity refers to how much water is mixed in with the air around us. Everywhere on Earth there is always at least some water mixed in with the air; in some places, like the desert, it's just a little; in other place, like by the ocean or in a rainforest, it's a lot.The air can only carry around a limited amount of water vapor (evaporated water, or water in its gas form). At some point, there can be more water vapor than the air can hold, and the water turns into little droplets, which in nature is clouds, fog, or rain.Just "humidity," also known as "absolute humidity," means "what is the concentration of water vapor (evaporated water) in the air right now?" In other words, it would give you a measurement of how much water you would get if you could take a box of air and squeeze all the water out.This is expressed in units of mass/volume. So, for example, you could express the absolute humidity as 5 grams per liter (5 g/L) if there were 5 grams of water vapor floating around in every liter of air.Again, the air can only carry around a limited amount of water vapor. How much it can carry is determined by the atmospheric pressure and the temperature. There is a mathematical equation that lets you figure out the maximum amount of water that the air can carry based on the pressure and temperature. Relative humidity is how much water the air is actually carrying divided by how much water the air could possibly carry. People, especially weather forecasters, usually express this as a percentage. So, if the air in a particular place is carrying exactly half the amount of water that it could theoretically carry, the relative humidity would be 50%. If it were carrying all the water it could theoretically carry, the relative humidity would be 100%. The relative humidity can never be higher than 100% or lower than 0%.Relative humidity has no units, because it is just a fraction.So, ways they are alike:1. They both talk about how much water vapor is mixed with air in a particular place.Ways they are different:1. Humidity has units (mass/volume) but relative humidity is just a fraction or percentage.2. Humidity doesn't care about how much water vapor it's possible for the air to have, but relative humidity does.3. Humidity doesn't tell you anything about how close the air is to having rain or fog, but relative humidity does.Specific humidty is the amount of water in unit amount of air by weightandRelative humidity is the amount of water in unit amount of air by pressure(partial pressure)Relative humidity is one means of describing the amount of water in the air. Relative humidity describes the amount of water in the air as that precentage of the total amount air at that temperature should be able to hold.Absolute humidity describes the amount of water in the air by saying how many grams of water per milliliter of air are present.

Usually "percent" which is the percentage of water in the air which can be retained in the air without it condensing (to a fog). Otherwise, grams/litre.

The efficiency of a machine is usually expressed as a percentage. The ideal efficiency of a machine is 100-percent.Another AnswerThere are no units of measurement for efficiency, because you are comparing like with like: output power divided by input power.

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