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gtforever
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I know the ideal gas law applies, but how?
Lsos said:So, if you take a 1600 liter jug filled with steam and try to condense it back into liquid...
...some equilibrium will be reached where the pressure in much less than atmospheric.
Lsos said:When water turns into steam, it occupies about 1600 times the volume (at standard temperature and pressure).
So, if you take a 1600 liter jug filled with steam and try to condense it back into liquid, the resulting water will only want to take up 1 liter of space. The rest is, well, nothing. Vacuum.
klimatos said:At standard temperature and pressure, you are not going to have steam. You will have water vapor. Steam is defined as water vapor at temperatures above 100°C.
If the volume remains constant at 1600 liters, the only way you can produce condensation is by lowering the temperature. Once condensation starts, you will have a water/vapor interface until that water turns to ice. You will eventually have an ice/vapor interface and that interface will continue to exist no matter how low you drop the temperature.
This is because the ice surface molecules will have a Boltzmann distribution of kinetic energies of translation at every temperature. No matter how cold the ice gets, some of its surface molecules will have sufficient kinetic energy of translation to escape the surface and become vapor molecules.
The net result is that you cannot condense all of the vapor without reducing the volume of the container to the volume that liquid water or solid ice will have at that temperature.
swasthiku said:good explanation
but how can we explain that process use "ideal gas equation"
condensation is at isothermal process. ( T = constants)
but it will give wrong explanation because P1.v1 = P2.v2
is there any better explanation use thermodynamic equation ?
Condensation is the process by which a gas or vapor turns into a liquid. In the case of steam, it occurs when the steam loses heat and changes back into water. This can happen when the steam comes into contact with a colder surface or is exposed to cooler air.
When steam condenses into water, it takes up less space because the molecules are closer together. This decrease in volume creates a vacuum, or an area with lower pressure, in the immediate surrounding area.
As mentioned before, when steam turns into water, it takes up less space. This decrease in volume means that there is now less air occupying the same area, resulting in a lower pressure or vacuum.
The creation of a vacuum through steam condensation has many practical uses. It can be used in steam engines to generate power, in refrigeration systems to cool and preserve food, and in distillation processes to separate liquids based on their boiling points.
Yes, steam condensation can create a vacuum in a closed system as long as the steam is allowed to lose heat and turn into water. However, the vacuum will only be created in the immediate surrounding area and not throughout the entire closed system.