Questions tagged [humidity]

For questions relating to humidity. Humidity is the concentration of water vapor present in the air.

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Humidity diffusion in Silicone Elastomer and effects on refraction / transmissivity

There is an issue I'm facing that is very tricky. A solar cell that is encapsulated in Sylgard 184 Silicone Elastomer with a front borofloat front glass. This cell is used to measure a light intensity....
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35 views

Conditions for a substance to show deliquescent or efflorescent behaviour

I have learnt that deliquescent substances are the ones which absorb moisture from the surroundings and convert them to solution and efflorescent substances are the ones which release moisture into ...
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What happens when the amount given doesn't allow for equilbrium to be achieved in a reaction?

The reaction $$\ce{A.3H2O(s) <=> A.H2O(s) + 2H2O (g)}$$ has a $K_p = \pu{400 mmHg2}$ One millimole each of $\ce{A.3H2O}$ and $\ce{A.H2O}$ are taken in a $\pu{1 l}$ container at $\pu{300 K}$ ...
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45 views

Rock salt as a green, non-electrical dehumidifier?

Has anyone tried using rock salt as a dehumidifier? Ive read a few DIY bits on it. I live in Georgia and its swampy and humid. I have a couple small dehumidifiers but I'm looking for some green and ...
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45 views

Does urine make concrete hygroscopic?

TLDR: Does urine make concrete hygroscopic enough to absorb moisture from the air so much that a spot of humidity is visible? Are uric acid crystals moisture-absorbent? (Urea apparently is according ...
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1answer
31 views

CO2 + High humidity = transperent substance?

First I want to point out that I am not a chemist, sorry for bad description. I have CO2 incubator. CO2 concentration is 10-20% and the humidity level is around 90%. I was using a humidity sensor to ...
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23 views

How to resolve Amine Blush problems of a Epoxy curing Agent without having to change the temperature and moisture of the air?

The formation of Carbamate as a result of the reaction between amine groups of curing agents and H2O/ CO2 leaves the surface of the cured epoxy with some blurry lines and dots. the typical solutions ...
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112 views

How do I calculate the humidity inside sealed containers containing mixing salts?

At $\pu{25 ^\circ C}$: saturated Magnesium chloride $\ce{MgCl2}$ keeps humidity 33% inside sealed containers. saturated Sodium chloride $\ce{NaCl}$ keeps humidity 75% inside sealed containers. I ...
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51 views

Relative humidity at constant temperatures [closed]

It’s known that Relative humidity = (water pressure in a certain volume/ saturated water pressure in the same volume)* 100% “at the same temperature” So my question is why does the amount of water ...
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56 views

How to perform IR spectroscopy on silica particles at various relative humidities when they are passed through a tube using pressurized air? [closed]

Surface bonds of silica particles are susceptible to humidity and frequently change between silanol and siloxane with changing RH. I want to measure how these surface bonds change with the humidity ...
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373 views

Does ice increase the humidity of its surroundings? [closed]

Does ice increase the humidity of its surroundings? I'm trying to use the BME280 for an Arduino project regarding locating ice, but I don't know whether the atmosphere is more humid around ice. I'm ...
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794 views

Is it possible to find the volume of condensed water by temperature change without knowing the initial pressure of the flask?

I found this problem in a practice sheet. The original source doesn't indicate any authorship or whatsoever. It states the following: A sealed container of $\pu{6.24 L}$ in capacity has humid air ...
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242 views

Can I completely dry air with calcium chloride?

I'm trying to dry air by leading it through calcium chloride. I'm measuring the resulting humidity with a simple capacitive humidity sensor. I do not see measurements below 10% relative humidity, but ...