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# How does relative humidity change with temperature changes?

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###### 2008-12-08 22:42:18

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.

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## Related Questions

Relative humidity is a ratio to show how saturated the air is. To change relative humidity, the amount of moisture in the air must change (such as winds blowing in drier or more humid air from another place) or either the amount of moisture stays the same but the temperature changes.

Either dehumidify (remove water vapour), rehumidify (add water vapour) - both at constant temperature, or raise temperature (which will lower relative humidity), or lower temperature (which will raise relative humidity).

Yes. Relative humidity is the amount of water vapor actually in the air compared to the amount that could be in the air (saturation point) at the exisiting temperature. So, if the temperature of the air changes and the amount of water vapor in it does not, the relative humidity will be different. But, if the temperature of the air changes and so does the amount of water vapor in it, then the relative humidity could be the same as before the temperature change. That is to say that the air could contain the same percentage of water vapor that it could hold at each temperature, even though the actual amounts are different.

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!)

The temperature can change (in this case, drop). Relative Humidity is the amount of water air can hold at a certain temperature.

If there is no change in the amount of atmospheric moisture, humidity will decrease as the temperature warms. Remember that relative humidity is relative to the amount of moisture the air can hold. If you keep the moisture constant and increase the temperature (increase the amount of moisture the air can hold), you'll have a smaller fraction, and therefore a lower relative humidity.

When the temperature of air is cooled or reduced the relative humidity (RH) increases. The moisture content of the air remains the same until the RH rises to the point of 100% saturation and condensation occurs.

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%.

Oxygen changes temperature and it also changes temperature. Example: Humidity causes air to be more moist.

Changes in humidity are physical, NOT chemical, changes.

The climate does not change quickly. However, the weather can change quickly in the desert. There is little humidity to hold in heat or to slow heating. The humidity acts somewhat like a buffer to slow temperature changes. Without the humidity, the temperature can change more rapidly than in an area with higher humidity.

As the sun goes down, the temperature drops and the capacity to hold water vapor in the air decreases increasing the relative humidity above 0 percent

Relative humidity is a ratio between the partial pressure of water vapor and the saturation pressure of water vapor at the current temperature and pressure. If the temperature and pressure change, then the relative humidity will change also. You are correct that higher temperatures allow the atmosphere to hold more water. That means that the saturation pressure of water vapor has increased while the current vapor pressure has remained the same, causing the relative humidity to drop. We think of humidity as how hot and sticky it is outside. The closer the water vapor pressure is to its saturation point, the more hot and sticky we feel. We associate humidity with heat since that is when we are uncomfortable, but rain is caused by the relative humidity rising to 100% because the humid air cooled to the point that the saturation pressure dipped below the current vapor pressure (or other pressure changes, or a combination of both). You can learn more at the link below. I hope this helps.

1) Change the amount of water vapor available; if there is liquid water present, for instance, a lake, you can have an increase in relative humidity by evaporation from the surface of the lake. This is pretty obvious. You're adding water vapor, so the humidity increases. 2) The other way is to change the temperature of the air, while holding the water vapor constant. Even though there is no water source, and no water vapor is added, a lowering of air temperature results in a rise of relative humidity. This is automatic. The amount of water vapor that could be present at saturation is less at the lower temperature, so the existing amount of water vapor represents a higher percentage of the saturation level of the air. Similarly, a rise in temperature results in a decrease in relative humidity, even though no water vapor has been taken away. Key point to remember: Given that the amount of water vapor is held constant, then if you --reduce the temperature, the relative humidity goes up --increase the temperature, the relative humidity goes down.? 3) At a given temperature, the quantity of water vapor is inversely proportional to changes in pressure: falling pressure will increase the moisture content.?

No. Dew point depends on the amount of moisture in the air, and not on temperature. It is relative humidity that depends on both temperature and moisture content.

Air temperature rises because the air compresses and warms adiabatically (simply because pressure increases). But no moisture is being added or removed from the air, so the dew point and absolute/specific humidity do not change. What changes is relative humidity, which lowers, due to the warmer air being able to hold more moisture.

Because relative humidity changes with temperature. Air at 30 F and 90% humidity actually is holding less water than air at 90 F and 20% humidity. Dew point will give you a better idea of how much moisture is in the air because it doesn't change with temperature. For example, dew points in the 70's will always feel very sticky and uncomfortable because that is a lot of moisture in the air.

The relative humidity in a closed vessel will not change due to pressure. Assuming water is the fluid, the relative humidity will stabilize to 100%.

changes in atmospheric temperature, pressure, wind speed, wind direction,humidity, clouds, rainfall etc....

It is usually a measure of how much one variable changes relative to changes in other variable(s). The pressure of an ideal gas depends on its temperature and volume. There are rates of change for pressurerelative to the temperature (with volume held constant),relative to the volume (with temperature held constant), anda multivariate rate of change when both can vary.Next, the rate of change need not be constant. For a body in accelerated motion, the rate of change of location (its velocity) varies with the acceleration. And that, in turn could vary with the force acting on the body.

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