Difference between steam and gas.

Substances in a gaseous state are widespread in nature. They form the Earth's atmosphere, are found in the water of oceans, seas and rivers in significant quantities. Gases can exist independently, or they can be obtained as a result of vaporization processes.


Par represents the gaseous state of a substance when the gaseous phase is in equilibrium with the liquid phase of the same substance.

Gas is a molecule chaotically moving in all directions, this is the state of aggregation of matter.


Steam is produced as a result of the evaporation process from the surface of the liquid. This process is called vaporization, and the reverse process, as a result of which steam turns into a liquid, is called condensation. Steam can be saturated or unsaturated. Saturated steam is produced by the boiling process and is in dynamic equilibrium with the liquid. The volume of liquid due to condensation of steam does not increase and does not decrease due to its evaporation. An example of saturated steam is a small amount of water in a vessel that is hermetically sealed.

Unsaturated steam is a steam that has no thermodynamic equilibrium with its liquid. The unsaturated vapor pressure will always be less than the saturated vapor pressure at a given temperature. If there is unsaturated vapor above the surface of the liquid, then the vaporization process will prevail over the condensation process. The amount of liquid in the vessel will gradually decrease.

What is the difference between water vapor and air? Only water particles are present in the water vapor. And in the composition of the air there are chemical elements in large quantities, such as hydrogen, oxygen, carbon dioxide, nitrogen and a small amount of water vapor.

Gases are the aggregate state of matter. Molecules in it move chaotically, independently of each other. The particles are not bound or are weakly bound by the forces of interaction, and therefore move freely. Gas has no shape of its own; it occupies the volume it provides and is easily compressed.

Conclusions TheDifference.ru

  1. Gas exists independently in nature. Example: nitrogen, oxygen.
  2. Steam is produced from a liquid substance during vaporization.
  3. Air and steam have differences in chemical composition.