All Questions

Tagged with
Filter by
Sorted by
Tagged with
0
votes
1answer
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. ...
2
votes
3answers
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 ...
0
votes
1answer
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, ...
0
votes
0answers
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 ...
0
votes
1answer
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 ...
0
votes
2answers
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 ...
0
votes
1answer
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 ...
0
votes
1answer
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 ...
3
votes
0answers
67 views

Can I always assume that a vapour pressure over a liquid is ideal?

Can I assume that the vapour of a subject over its liquid is ideal-ish? I'm thinking that if the vapour pressure is low the subject in question wont interact with itself, but it doesn't necessarily ...
3
votes
1answer
2k views

How can I interpret negative values of potential evapotranspiration?

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 ...