Elevation or depression is inversely proportional to the diameter of the tube. The elevation or depression decreases as the temperature increases. The elevation or depression depends on the surface tension of the liquid. Gases do not have a definite shape nor a definite volume. Gases will expand indefinitely to completely fill the container in which they are placed.
Gases exert a pressure on the walls of the container in which they are placed.
This is a result of the fact that gas molecules move independently of one another and often at high speeds. The molecules of gases exert no attractive or repulsive forces on each other. Gases will diffuse and mix completely with other gases, forming a completely homogenous mixture. The diffusion of gases is much quicker than that of liquids. Gases will also diffuse through solids and liquids.