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Himidity is the amount of water vapor present in the air. Relative humidity is a measure of the amount of water vapor present in the air compared to the amount needed for saturation at a specific temperature
Wiki User
∙ 12y ago
Wiki User
∙ 12y agoI'm assuming you're asking for the difference between specific humidity and relative humidty. If so...
Relative humidity is exactly that: it is relative to the temperature. Warmer air can hold more moisture than cooler air, so if warm air is 40% humid, and cool air is 40% humid, then the warmer air is actually more humid than the cooler air, even though the RELATIVE humidity is the same.
Specific humidity is expressed in GPP, or Grains [of water] Per Pound [of air].
Example:
If the air is 60 degrees, and the relative humidity is 40%, then a pound of that air contains 31 grains of water.
If the air is 80 degrees, and the relative humidity is 40%, then a pound of that air contains 61 grains of water.
As a result, even though the relative humidty is the same in both examples (40%), the air that is 80 degrees is almost twice as humid as the air at 60 degrees.
Elevation (feet above sea level) plays a factor.
The formulas for computing relative/specific humidity (among other things, such as vapor pressure, heat index, dew point) are in the science called psychrometrics, and note the spelling: psychro (with an "r"), not psycho.
Wiki User
∙ 11y agoHumidity means amount of water vapour present in air with respect to total amount of air.
Relative humidity means ratio of amount of water vapours per unit volume of air to the capacity of air to held maximum water vapours in unit volume of air, at given air temperature.
Wiki User
∙ 12y agoThe amount of water vapor present in air is called humidity.
The amount of water present in air as a percent of the maximum amount that the air can hold at that particular temperature is called relative humidity.
Wiki User
∙ 10y agoHumidity is the amount of water vapor present in the air. The relative humidity is the measure of the amount of water vapor present in the air compared to the amount needed for saturation.
Wiki User
∙ 12y agoRelative humidity is percentage of water relative to how much air can hold if saturated
Absolute humidity is actual amount of moisture in the air
Wiki User
∙ 9y agoRelative humidity is a ratio for determining if water vapor is in the air. Absolute humidity is the amount of water vapor in the air.
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How do the relative humidity measurements for inside and outside compare?
They compare because relative humidity measures the maximum amount of moisture in the air.
How can relative humidity and dew point be used to predict the weather?
Relative humidity expresses a percentage of humidity in the air to the maximum amount of humidity that could be in the air. For example: when the temperature rises the air will be able to hold much more humidity so the relative humidity will drop.
What is the amount of water vapor in the air compared to the amount that could be in the air at that temperature?
relative humidity
What is the difference between absolute and specific humidity?
Relative humidity is a ratio of the actual water vapor content of the air to the amount of water vapor needed to reach saturation. Absolute humidity is the mass of water vapor contained in a given volume of air.
How does humidity change over 24 hours?
Cold air cannot hold as much water vapor as warm air. As temperature drops relative humidity rises. Absolute humidity remains constant until the dewpoint temperature is reached, then decreases with temperature as water precipitates out of the air. Below the dewpoint temperature relative humidity remains constant at 100%.
How do the relative humidity measurements for inside and outside compare?
They compare because relative humidity measures the maximum amount of moisture in the air.
The amount of water that actually exists in the air at a given time?
Absolute humidity refers to the amount of water vapor that exists in a given volume of air at a given time. Relative humidity is absolute humidity relative to the maximum humidity for the current temperature.
What is a sygrometer?
There is no such thing as a sygrometer, but a hygrometer is a device that is used to measure the humidity of the air. It can indicate relative humidity or absolute humidity.
What is absolute and relative humidity?
Relative Humidity (RH), is how much water vapor is in the air at a certain time. Humidity, in my opinion, is just another way of saying how much water vapor is in the air.
How did the relative humidity at different times of the day compare?
kool beand
Measure of humidity?
Relative humidity and is expressed as a percentage. Absolute humidity is expressed as a concentration - mg/L. Specific humidity is a ratio of masses - water to air in a finite volume.
What is the difference of absolute age and relative age?
In the absolute age, the value will be exact and direct but in the relative age you will compare the rock with other feature.
What are humidity measurements based upon?
Air humidity measurements are based on the water content of the air, expressed as volume percentage: Relative Humidity = percentage of saturation at a given temperature Absolute Humidity = percentage of water in the air, regardless of saturation or temperature. The humidity that is talked about in weather reports, is relative humidity.
Which is the comparison of the amount of moisture in the air to the amount of moisture it can hold?
relative humidity
How can relative humidity and dew point be used to predict the weather?
Relative humidity expresses a percentage of humidity in the air to the maximum amount of humidity that could be in the air. For example: when the temperature rises the air will be able to hold much more humidity so the relative humidity will drop.
Why is temperature countable but humidity is not?
The word humidity does have a plural, humidities, but the state of "being humid" itself is uncountable. What we actually measure as humidity is the relative humidity, comparing it to the maximum possible at that pressure and temperature. Referring to these measurements as "relative humidities" would not be grammatically incorrect, but you could also use the singular just as well. ("We're going to compare the relative humidity in Texas and Oklahoma.")
Amount of moisture in air compared to amount needed in saturation?
Relative humidity.
