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The amount of water vapor actually in the air is called the?
The amount of water vapor in the air is called the absolute humidity. It is usually expressed as grams of water vapor per cubic meter of air.
Units for humidity?
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!)
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.
What is the density of mercury at 25 degrees Celsius?
The density of mercury at 25 degrees Celsius is approximately 13.6 grams per cubic centimeter.
Water density at 24 degrees celsius?
The density of water at 24 degrees Celsius is approximately 997.0 kilograms per cubic meter.
If a parcel of air is capable of holding 28 grams per cubic meter but it only contains 21 grams?
75% relative humidity.
Weight of a cubic foot of air?
Air has a specific volume (cubic feet per pound) of approximately 13.8 (cubic feet per pound) at 78 degrees F and 50% relative humidity. The specific volume ranges from about 12.4 cubic feet per pound at 31 degrees F and 50% relative humidity to about 14.8 cubic feet per pound at 105 degrees F and 50% relative humidity. The specific volume varies as a function of temperature and humidity. ------------------------------------------------ The correct term is mass not weight. According to the International Standard Atmosphere at 15 oC and 760 mm col. Hg the density of pure, dry air is 1,225 kg/m3. So, a cubic foot has a mass of 34,7 g. For other conditions it is of course necessary to know the characteristics of air in the specified location and time.
What is the relative humidity of 25 degrees and 28 degrees?
There is no fixed relative humidity by temperature. There is an absolute maximum, determined by temperature and pressure. At 25 degrees C, air can hold about 23.04 grams of water per cubic meter (g/m3) At 28 degrees C, air can hold about 27.4 grams of water per cubic meter (g/m3). This is about 19.3% more water vapor. *This is based on standard atmospheric pressure. Denser air hold more, thinner air holds less.
The amount of water vapor actually in the air is called the?
The amount of water vapor in the air is called the absolute humidity. It is usually expressed as grams of water vapor per cubic meter of air.
How much water can the air hold when the relative humidity of the air is 25?
how much water vapor can a cubic meter of air hold at 25 centigrades grades?
How much water can 1 cubic meter of air hold at 20 degrees C?
1 cubic meter of air at 30 degrees C can hold 30 grams of water As air cools it holds progressively less, thus as 20 degrees C it is just under 20 grams per M3, and at 10 degrees c it's closer to 8 grams. http://www.bom.gov.au/lam/humiditycalc.shtml
How to Calculate actual humidity from relative humidity?
One can calculate the absolute humidity (AH) from the relative humidity (r) using three equations: (1) the equation for mixing ratio, (2) an equation for relative humidity expressed in terms of mixing ratio, and (3) the Clausius-Clapeyron equation, which relates saturation vapor pressure to temperature. The result of combining the three equations is: AH = (1324 r/T) [exp {5417.75 (1/273 - 1/T)}] where AH is expressed in grams per cubic meter, T is temperature in Kelvin, r is relative humidity (range is 0 to 1), and the relation holds true for T>273. For T<273, replace 5417.75 with 6139.81.
How do you figure out how cubic pounds of water is in 1 cubic foot of air with 20 degrees and 30 humidity?
http://www.vaisala.com/humiditycalculator/?SectionUri=%2finstruments%2frhcalc In the advanced form of this calculator you can find lbs/MMSCF of water in air at whatever temp, humidity, pressure. With some calculation you can get what you're looking for. Cheers
The effort of relative humidity and how temperature affects the body?
Evaporation of moisture has a cooling effect and our bodies use the effect to control internal temperatures. The ability of of an atmosphere to absorb moisture is determined by the amount of moisture it has already absorbed. For instance, at room temperature (21 degrees C) air at 101 kPa pressure can hold 18.3 grams of moisture per cubic metre of air. If the air contains only 12 grams of moisture then it contains about 65% of the total amount it could contain. Therefore it's relative humidity is 65% and it has the ability to absorb more moisture. Obviously, as the relative humidity of an atmosphere rises it's ability to absorb more moisture decreases thus suppressing evaporation and the cooling effect it produces for our bodies. In short, higher humidity causes us to feel hotter as we lose our ability to cool ourselves.
How much water can one cubic meter air hold at 100 degrees Fahrenheit?
At 100 degrees Fahrenheit (approximately 37.8 degrees Celsius), one cubic meter of air can hold about 0.0223 kilograms of water vapor, which is roughly equivalent to 22.3 grams. This is based on the saturation vapor pressure at that temperature. The actual amount of water vapor in the air can vary depending on humidity levels.
What is the lowest possible temperature for a cubic meter of air that holds 50 g of water vapor at 10 degrees Celsius?
The lowest possible temperature for a cubic meter of air holding 50 g of water vapor at 10 degrees Celsius is the dew point temperature, at which the air becomes saturated. The dew point temperature is around 7.7 degrees Celsius for these conditions.
Can you use a 48000 BTU AC unit to cool a 4000 cubic foot well-insulated room to 60 degrees and keep the humidity at 65 percent?
I would go with a 5.5 ton 66,000 btu
