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87 views

### Does the saturated vapor pressure depend on the external pressure or just only temperature?

So far I understand that the saturated vapor pressure is the pressure exerted by a substance in liquid (or solid) vapor equilibrium, and that this pressure depends on the temperature of the system. ...
616 views

### What law or formula discusses the relationship between pressure and dew point?

A lot of times, dew point is focused primarily upon temperature and relative humidity. However, that same point of saturation is affected by the pressure, but I can't find a formula, or law even, that ...
483 views

### Is vapor pressure affected by dissolved gasses in the liquid?

If I take a half full bottle of water, seal it with a pressure gauge, and wait a few days then it will be at equilibrium. If I observe the pressure, that would be the water vapor's pressure. However, ...
85 views

### How many water molecules in the air - is my calculation correct?

I want to know how many water molecules are in one cubic meter of air (Relative humidity=20%, Temperature=293K) This is my calculation: $p=2.3kPa$ (because of vapor pressure at 20C is 2.3 kPa (as on ...
286 views

### How to obtain the vapor density at low pressure?

By lookup of the CRC Handbook, I could obtain the vapor pressure of water or mercury as a function of temperature. For example, it is $138~\mathrm{Pa}$ at $400~\mathrm K$ for mercury. Now I want to ...
168 views

### Moles of gas in a VLE mixture

I have a system in vapor-liquid equilibrium which also has some gas inside (let's say that the VLE system is Water and the gas is Air). The system looks like this: There is some heat applied to it ...
635 views

### Reduced Pressure and Cooling

Hi Knowledgeable folks, Since boiling point of a liquid can be reduced via pressure reduction. I was wondering whether this is possible: Add some liquid (alcohol or Water) in a container, reduce the ...
133 views

### Understanding the relation between pressure, ideal gas and, volume

I was given the following formula which is used for ideal gasses: $$pV = nRT$$ where: p:pressure V: volume n: number of moles R: gasconstant T: temperature now when speaking about vaporpressure ...
If I extract Potential Evaporation (PET, W/m$^2$) from the National Centers for Environmental Prediction (NCEP), climate reanalysis data (downloadable as netCDF files here), there are some negative ...