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
I'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.
Humidity 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.
The 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.
Humidity 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.
Relative humidity is percentage of water relative to how much air can hold if saturated
Absolute humidity is actual amount of moisture in the air
Relative humidity is a ratio for determining if water vapor is in the air. Absolute humidity is the amount of water vapor in the air.
They compare because relative humidity measures the maximum amount of moisture in the air.
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.
relative 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.
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%.
They compare because relative humidity measures the maximum amount of moisture in the air.
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.
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.
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.
kool beand
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.
In the absolute age, the value will be exact and direct but in the relative age you will compare the rock with other feature.
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.
relative humidity
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.
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.")
Relative humidity.