Chemistry

Difference between Vapor and Gas

we explain the basic difference between Vapour and Gas is that vapor is a mixture of liquid and gaseous phases at room temperature. E.g. Water vapors, iodine vapors, etc. on the other hand, Gas is a substance that exists in the gaseous state at a given temperature equal to more than the boiling point. E.g. Oxygen, helium, carbon dioxide, nitrogen, etc. a gas is a state of matter and it contains particles only in one state, that is gaseous state. while a vapor contains particles at both states: gaseous and liquid.

Difference between Vapor and Gas in tabular Form

Vapor Gas
in ordinary conditions, vapors are present in the form of solid and liquid states but changing certain conditions they can be changed into gaseous states under specific conditions. under ordinary conditions such as room temperature and one atmospheric pressure, gases are present in a gaseous state.
it is a mixture of two or more different phases under the standard room temperature and pressure. At room temperature, they contain a single thermodynamic state i.e. gaseous state.
they can interchange the phase i.e., from liquid to gas or from gas to liquid. phase change does not matter in the form of gases. the phase change will bring the change of state of gas into a liquid.
it is not considered a state of matter, unlike gases. gas is considered a state of matter.
vapors are not in the form of a gaseous state at a natural state but they can be solid or liquid. the natural state of the gas is called the gaseous state.
it is a collection of particles that do not have any definite shape when observing under the microscope. like vapors, gases also do have not any definite shape while observing under a microscope.
they are the substances that are made by the combination of two phases i.e., gaseous and liquid at ordinary conditions. they are substances having a single thermodynamic state at ordinary state and condition.
water vapors can be made below the boiling point of water. gases are formed only at above critical temperature and below critical pressure.
they are usually made of molecules and atoms due to random motion. when molecules and atoms move randomly gases are formed.
changing iodine into vapors under ordinary conditions by heating it up is a good example of vapors.  Oxygen, Nitrogen, and Argon all are good examples of gases.

What are Vapors?

according to physics, vapors in the gas phase are those substances that have a lower than the critical temperature. in other words, they can be condensed into a liquid by increasing their pressure but the temperature remains constant. it is a different form from the aerosol.

Properties of vapors

as vapors are phases of gas at a certain temperature. on the other hand, this specified substance can also exist in other forms of matter like liquid or solid. this condition can only exist at a lower temperature than the critical temperature. for example, the highest or critical temperature of the water is 374 °C 647K at which water can exist in liquid form.

when two phases i.e. vapors and liquid remains in contact with each other, these two phases maintain their equilibrium state or compressible fluid phase.  the two processes i.e. condensation and formation of clouds are due to the vapors phase. with the help of gas chromatography, vapors are used to carry out physical processes of distillation and vacuum extraction.

the molecules present in vapors possess different forms of motion like translatory, rotatory and vibratory motion. this motion leads us to the kinetic theory of gases.

What are Gases?

gases also belong to the three major states of matter in which particles present at a very far distance from another and hence are always ready to move freely and very quickly. they are not particularly attached to one another in any sense.

due to the long distances between the molecules, gases are supposed to be less dense than liquids and solids.  for example, a balloon filled with ordinary gas can be picked up easily as compared to a jug filled with water. this is due to the less or no intermolecular forces between gas molecules. these forces are present at a higher level between solids and liquids molecules and tighten their atoms and molecules with each other.

General Properties of Gases:

  • they do not have a fixed shape hence can occupy all the space available in the container in which they are filled.
  • gases also do not have a fixed volume like solids and liquids. the molecules of gases expand everywhere across an area. e.g. perfume spreads in the room.
  • they can be mixed easily with other gases.
  • the compression of gases is relatively easy because of the large space present between the molecules of gases. they can squish down easily but are less compressible.

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