# Relationship between barometric pressure and humidity

### The Definitions of Temperature, Dew Point and Barometric Pressure | Sciencing

We found significant effect of low atmospheric pressure/relative humidity on mortality. There was . Relationships between weather and myocardial infarction : a. 50 to 85% is humid and damp air and skin feels soft and silky. What is the relation between pressure and temperature, humidity and pressure, temperature . Relative humidity (RH) is the ratio of the partial pressure of water vapor to the equilibrium vapor pressure of water at a given temperature. Relative humidity depends on temperature and the pressure of the system of interest. The same amount of water vapor results in higher relative humidity in cool air . Buck has reported that the maximal relative error is less than %.

### Relative humidity - Wikipedia

Barometers Atmospheric pressure or air pressure is the weight of the Earth's atmosphere on the surface at a given location. It is generated by the downward force of Earth's gravity.

Humidity

Atmospheric pressure depends on the amount of air above the location where the measurement is taken, consequently the pressure drops as you go higher. Air pressure decreases by about 1 inch of mercury for each 1, feet of elevation or 1 hectopascal for each 8 meters above sea level. This knowledge led to the development of water barometers in Atmospheric pressure is also known as barometric pressure because barometers are used to measure it.

## Relative humidity

Air pressure measurement is considered to be static little or no air movement. Inches of mercury refers to how high the air pressure pushes the mercury in barometers. In the metric system, the unit of pressure is the Pascal, named after the 17th century scientist Blaise Pascal. Pascals are a direct measurement of atmospheric pressure, like pounds per square inch. In order to avoid large numbers, air pressure is reported in hectoPascals.

It turns out that in a high pressure area, air is flowing out to areas of lower pressure. This air is replaced by air from the upper atmosphere which is colder and thus drier. So people inside a high pressure area notice that the air is drier than usual.

Likewise, low pressure areas draw in warmer, moist air so people in a low pressure area would notice higher humidity. Storms occur when a cold air mass and a warm air mass meet. Since the warm air and cold air don't mix very well, one air mass rises and the other doesn't.

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Which air mass rises? When this air mass rises to high altitude what do you think happens to its temperature? How would this effect its humidity? By the way, I made a mistake before when I was talking about vapor pressure.

A liquid boils at a temperature at which the vapor pressure equals the total pressure over the liquid. Thus water boils at Celsius because the vapor pressure of water at that temperature is one atmosphere. Sorry about any confusion I caused! This is one of the things that go somewhat against general experience.

Humidity is defined to be: Another way of saying this is that humidity is the mole fraction of water vapor in the air divided by the mole fraction of water vapor in air in equilibrium with liquid water. During a rainstorm, or a heavy fog, liquid drops are suspended in the air for longer or shorter times and the air is fully saturated with water vapor in equilibrium with the water drops at that temperature.

There can only be so much water vapor in air at a given temperature, and this amount increases very quickly with increasing temperature. However, wet air is actually less dense than dry air.