Properties of Gases


Gas is a peculiar condition of matter wherein the molecules seem to be widely separated and continually moving at tremendous speeds. Gases possess no fixed size, shape, or volume. Ideal gases include those in wherein the intermolecular attractive forces become zero. In ideal gases, molecules travel at high rates of speed, which causes all particles to be far distant from the closest particle, reducing the bonds between the molecules. Natural gases at extreme temps as well as low pressures are suitable. As the temp rises, so does the kinetic energy, causing the intermolecular force to diminish.

What is Gaseous State?

A gaseous state is indeed a form of matter that has a specific mass but no fixed form or volume. The most significant attributes are quantity, volume, pressure, as well as temperature since these 4 individual variables explain the phase of the gas.

The atmosphere contains a complex combination of gases, including oxygen, carbon dioxide, water vapour, nitrogen, ozone, and many others. Yet, only eleven gases within the periodic table exist in the gas form under typical pressure as well as temperature circumstances. These would be regarded as pure gases but include  $\mathrm{H,N_2, O_2, Ne, Xe, Rn, Ar, Kr, F, Cl,}$ or even He.

Furthermore, in a gaseous form, particles in the gas have quite a huge distance among them but also seem to be full of enthusiasm. As a result, gas possesses a lot of kinetic energy. The particles travel quickly and clash with each other, leading them to arbitrarily scatter until they can be evenly distributed throughout the container.

Solid-liquid-gas.jpg: Sadi Carnot derivative work: Dave.Dunford (talk) 13:43, 15 December 2010 (UTC), Solid-liquid-gas, marked as public domain, more details on Wikimedia Commons

Properties of Gas

  • Since the particles in the gas are so far apart, the intermolecular force across them seems insignificant.

  • In comparison to the other 2 forms, the particles in gases seem to be extremely far apart. As a result, the molecules may be readily compressed. Increasing pressure reduces its volume, thus bringing the molecules relatively close together. As a result, the spaces between the particles shrink, producing the gases extremely compressed.

  • Gases have quite an extremely low density comparable to solids and liquids because intermolecular interactions among molecules become negligible. By lowering temperature as well as increasing pressure, density rises.

  • The gas particles have always been in constant, fast, and unpredictable motion throughout all directions, colliding with one another and along with the container's sides. The pressure produced by a gas is caused by gas molecules colliding with the module's walls.

  • Gases do not contain their shape. However, they adopt the shape of the container into which they should be placed. The molecules apply pressure upon the container walls as well as tend to fill the container's form.

  • Gases do not possess their volume. As a result, evaluating the volume of gas is analogous to determining the volume of the containers. It is expressed in litres or cubic metres.

  • Diffusion is the flow of particles from such a highly concentrated area to a low concentrated area. Atoms as well as molecules in a gaseous state move easily and randomly across space. As a result, they possess kinetic energy, but as this energy rises, so does the diffusion rate.

Uses of Gas

  • In both the home and corporate sectors, gas is largely utilized for heating, conditioning, or even cooking.

  • One such form of matter is employed as steam in a variety of commercial activities, including fabrics, plastics, polymers, paints, dyes, and aluminium smelters.

  • Natural gas, within the state of liquefied natural gas as well as compressed natural gas, is used as a vehicle fuel. As a by-product, it reduces hazardous emissions throughout the atmosphere as well as smog pollution.


  • The gaseous state aids in the production of energy. It may also be used as an alternate source in renewable energy-producing facilities when there is a dearth of wind or sunlight.

  • Natural gas is also used to manufacture fertilizers, cosmetics, as well as pharmaceuticals.


Gas would be a large collection of particles isolated by a large distance. The ideal gases have molecules that clash in flexible ways. These are characterized as compounds that are typically present in the gaseous form. They have intermolecular gaps and are generally compressible. Gases have quite a lower density than liquids as well as solids, and their viscosity is indeed very low because the atoms have smaller intermolecular interactions. Since they have no definite volume or shape, gases have no definite shape. Gases include hydrogen, nitrogen, oxygen, carbon dioxide, water vapour, and helium.


Q1. How many gases are there in the human body?

Ans. The human body consists of 6 elements that constitute 99 percent of its mass: O, C, H, N, Ca, as well as P. Only roughly 0.85% is made up of the remaining 5 elements: K, S, Na, Cl, and Mg. All eleven are required for survival.

Q2. What causes gases to spread so quickly?

Ans. There seems to be a lot of vacant space among particles that also have a lot of kinetic energy but aren't very attracted to each other. Gas particles travel very quickly and interact with each other, leading them to diffuse, or expand out, till they are uniformly distributed across the container's volume.

Q3. What tends to happen to gas as it cools?

Ans. The overall kinetic energy of the gas particles falls as the temperature drops. As a result, a greater fraction of gas molecules lacks the kinetic energy to resist intermolecular attractive interactions between adjacent atoms.

Q4. Which gases act the least optimally?

Ans. The existence of electrons seems to be high in $\mathrm{SO_2}$, resulting in stronger van der Waals interactions. It does have a strong boiling point as well as needs a high temp to act optimally due to the larger intermolecular force. As a result, at low temperatures, sulphur dioxide behaves as the least ideal gas.

Q5. What is known as laughing gas?

Ans. To calm you down, nitrous oxide is indeed a safe and efficient sedative chemical that is combined with oxygen as well as breathed through a tiny mask which fits across your nose. Nitrous oxide, commonly known as “laughing gas,” would be one alternative your dentist could provide to assist you feel more at ease during specific processes.

Q6. How often will natural gas be available?

Ans. Considering the same yearly pace of dry natural gas extraction in the United States of around 30 Tcfg in 2020, the country seems to have sufficient dry natural gas to last roughly 98 years.

Q7. Why should an ideal gas not take place?

Ans. The gas particles must have zero volume as well as display no attraction forces toward one another. But there's no such entity as an ideal gas because neither of those requirements could be valid. A real gas seems to not act as per the kinetic-molecular theory's premises.

Updated on: 18-Apr-2023


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