Introduction:

Surface tension is a property of liquids that arises due to the cohesive forces between the molecules at the surface. It is responsible for various phenomena such as capillary action and droplet formation. However, gases do not exhibit surface tension due to their unique molecular behavior and lack of intermolecular forces.

Explanation:

Molecular Behavior:
In gases, the molecules are in constant random motion and are far apart from each other. They have high kinetic energy and continuously collide with each other and with the walls of the container. These collisions result in the molecules spreading out and filling the entire available space, leading to their high compressibility.

Lack of Cohesive Forces:
Surface tension arises from the cohesive forces between the molecules in a liquid. These forces are responsible for the attractive interactions between neighboring molecules, which allow them to stick together and form a continuous surface. In contrast, gases have weak intermolecular forces or no forces at all. The molecules in a gas do not exhibit significant attraction or cohesion, which prevents the formation of a distinct surface and the development of surface tension.

Intermolecular Forces:
Liquids have various types of intermolecular forces such as hydrogen bonding, dipole-dipole interactions, and London dispersion forces. These forces contribute to the cohesive nature of liquids and give rise to surface tension. In contrast, gases typically have weaker intermolecular forces or none at all. The molecules in a gas are not held together strongly enough to form a continuous surface or exhibit surface tension.

Conclusion:
In summary, gases do not exhibit surface tension due to their molecular behavior and lack of cohesive forces. The constant random motion and wide separation of gas molecules prevent the formation of a distinct surface, and the weak or absent intermolecular forces do not allow for the development of surface tension. Surface tension is a unique property of liquids and plays a crucial role in various phenomena that gases do not demonstrate.

Becz. their low IMF force or zero