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The critical temperature of a substance is the temperature when the substance's vapor cannot be liquefied, whatever the pressure is.
We can convert the gases to liquids by compressing the gas at a suitable level of temperature.
As the temperature increases the gases become more difficult to liquefy, because the kinetic energies of the substance's particles which make the gas increase.
Viscosity is a property arising from collisions between neighboring particles in a fluid that are moving at different velocities.
Surface tension gives the surface of the liquid its shape. This happens due to two forces; cohesion and adhesion. These forces pull the molecules of the liquid inside resulting a spherical shape to the surface of liquid.
The SI unit of surface tension is N/m (Newton per meter) or dynes/cm (dyne per centimeter)
Cohesion force pulls liquid molecules that are on the surface inside
The critical pressure of a substance is the necessary pressure to liquefy a gas at its critical temperature. Some examples are shown below in the table.
Adhesion force is the force between the liquid molecules and the container
Surface tension allows heavy objects to float
Meniscus curves the liquids surface within a specific container, either concave up or concave down