Search results
19 de abr. de 2021 · A gas is material that would fill any volume up to the boundaries, ignoring gravity and the like. A vapor is a gas or gas-like material that's associated with a condensed-state transition. These aren't alternatives; something can be a gas or/and a vapor. Examples of each combination: Not vapor.
4 de ago. de 2015 · vapor pressure; partial vapor pressure; saturated vapor pressure (identical with equilibrium vapor pressure.) Let's assume that water has a equilibrium vapor pressure of 18 torr at STP (760 toor, 20 degrees C). Case 1. I have a flask sealed with some air and some water at my STP. The total pressure (i.e. the pressure) is 760 torr.
A measure of volatility is the vapor pressure. There is a very related term partial pressure. So if we think of air as being nitrogen and oxygen, then there is a partial pressure for nitrogen and a partial pressure for oxygen, and the sum of the two partial pressure is the actual pressure (the absolute pressure).
19 个回答. 我觉得这两个词最大的区别，在于 steam 是沸腾产生的，而 vapor 则是蒸发或者蒸发后又冷凝产生的。. steam 给人的感觉就是「热」，它的视觉效果是喷薄而出的水汽，或者热空气后面景物的摇晃；而 vapor 则不给人「热」的感觉，它要么看不见摸不着 ...
The answer turned out to be: d, c, b, a. However, I do not understand why this is the case. I know the formula for vapor pressure is: ΔP = −XP∘ Δ P = − X P ∘. which means that the pressure of the solvent is proportional to the mole fraction of the solute. I'm still not grasping why the aforementioned answer is correct though.
1. Volatility depends on four factors for organic compounds: 1) Branched chained hydrocarbons are more volatile than straight chained hydrocarbons. 2) The more branched an hydrocarbon is the more volatile it is. 3) Depending on the bonds i.e hydrogen bond, dipole-dipole intermolecular bond and van der Waals' forces.
30 de nov. de 2022 · $\begingroup$ In the contexts I'm familiar with, a gas is not necessarily a vapor. "Vapor" is reserved for compounds below their boiling point, and above the boiling point the terminology is "gas". I'm sure it varies by field, but the first sentence of this answer I think is overly absolute. $\endgroup$ –
13 de abr. de 2016 · The reaction of liquid -> vapor is, in fact, highly spontaneous because of this! But, the next little bit of vapor gets a smaller entropy gain - there is already vapor occupying the head space in the closed vessel. And the next little bit gets even less entropy. Yet, it keeps costing the same amount of enthalpy to convert the liquid to vapor.
5 de oct. de 2023 · Therefore, if the vapor pressure of water and iso-octane are approximately the same, the mass-rate of evaporation of octane should be greater. See also problem 1b here . Thirdly, since the density of octane is about 0.7 relative to water, if equal-volume drops are being evaporated, the rate of evaporation will be even greater than the mass-rate.
The partial pressure of a gas is the pressure exerted by a gas in the volume occupied by a mixture of gases, while the vapor pressure of a gas is the pressure exerted by a gas over its condensed phase. Although : The vapor pressure that a single component in a mixture contributes to the total pressure in the system is called partial pressure.
