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For questions about gas pressure, or the effect of pressure in general on chemical species, substances, or reactions.

10 votes

Do gas particles colliding with each other affect the overall pressure?

Deviation of real gas pressure is at not too high pressure and not too low temperature often negligible. … This has the opposite, pressure decreasing effect. …
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1 vote

Work done on a Gas?

The total work ( and its value for the constant force case ) for pressure $$p=p_\mathrm{force} + p_\mathrm{atm}$$ $$W_\mathrm{tot} = - \int_{V1}^{V2}{p \cdot \mathrm{d}V} $$ is shared between the source …
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2 votes

How can pressure build up in an equimolar gaseous reaction?

If we consider an idealised gas behaviour and the gas state equation $$pV = nRT$$ where $p$ is pressure $n$ is molar amount $R$ is universal gas constant $T$ is absolute temperature $V$ is gas volume … As the reaction is highly exothermic, temperature and therefore pressure significantly increase, as $$ p= \left( \frac {nR}{V} \right) T$$ …
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2 votes

Osmotic Pressure definition clarification

Rather as "...the pressure necessary...", not force. The full speed osmosis means zero differential pressure on the membrane. … The particular value of the counteracting pressure, that would cause the zero net water flow, is called the osmotic pressure of the solution. …
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3 votes

Variation of vapour pressure with application of external pressure

then the amount of vapor and its pressure accomodate to external pressure. (**) If the external pressure is kept greater than saturated vapor pressure for given temperature, all vapour will eventually … gas+vapor mixtures, liquid saturated vapor pressure increases little with the total pressure. …
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1 vote

Shouldn't the pressure of gas above a liquid slightly decrease when some of its molecules di...

The gas with liquid vapour, previously in equilibrium with liquid, with suddenly increased pressure: Vapour gets over-saturated and condenses until the saturated vapour pressure is reached again. … Gas starts dissolving and gas partial pressure decreases, until the new equilibrium between its partial pressure and it's molar fraction in liquid is achieved ( Henry's law ). …
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9 votes
Accepted

Is it possible to store moist air at high pressure?

. (*) If air is being compressed, the partial vapor pressure increases. It it reaches the saturated vapor pressure at given temperature, water vapor starts to condensate. … and therefore vapor capacity of space very slighly increases with total pressure. …
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1 vote

Doesn't adding an inert gas at constant volume increase the partial pressures?

}$, the total pressure raises to $\pu{10 atm}$, with partial pressures : $\ce{Ar} : \pu{5 atm}$ $\ce{N2} : \pu{4 atm}$ $\ce{O2} : \pu{1 atm}$ Note that pressure is macroscopic quantity. … Partial pressure of any gas is determined by frequency of collisions with a wall unit area, and by passed impulse by 1 molecule. …
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1 vote

Understanding how evaporation works

At $\pu{25 ^{\circ}C}$, all water eventually evaporates, if pressure is kept below vapor pressure at $\pu{25 ^{\circ}C}$, or condenses if pressure is kept above the vapor pressure. … Water at room temperature would evaporate to ambient air, if water vapor partial pressure is lower than (saturated) vapor pressure, in spite of the total pressure being much higher than vapor pressure. …
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9 votes
Accepted

Why does the vapour pressure not depend on the surface area and volume of a liquid?

Vapour pressure is intensive property. It depends for pure liquids (if we neglect minor secondary effects) only on temperature. …
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1 vote

Which way Le Chatelier's principle

The principle means that external change has smaller impact on the system ( in sense of the values of changed parameter, typically temperature or pressure, or change of composition), than it would have …
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24 votes

At what pressure will hydrogen start to liquefy at room temperature?

So to answer your question, you can get as high pressure as you can produce and the container can withstand, as there is no condensation reducing the pressure. …
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1 vote
Accepted

What causes water to condense when air pressure is reduced?

Reducing pressure causes temperature drop, as part of thermal energy of air is spent on mechanical work during air expansion. That is why there is cold air at high altitudes. …
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3 votes
Accepted

Why is the relationship between vapour pressure and boiling point of water non-linear?

If you took out vapor at some moment and if you put it in a container of a fixed volume then its pressure would linearly grow with temperature, as in the Charles' law. … It grows roughly exponentially with temperature and so does the pressure. …
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4 votes

Effect of Pressure on the Position of Equilibrium

But the reaction quotient, (formally the same expression as for the equilibrium constant, but for any reaction state), decreases with increasing pressure, if volume of reactants is bigger than of products … changes of both temperature and pressure changes both values $K$ and $Q$. …
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