When a thin glass tube is put into water, the water rises 1.4 cm . When the same tube is put int

step 1 my name is Ahmad Ali in this question we have glass booted in a peaker containing water we found

When a thin glass tube is put into water, the water rises...

When a thin glass tube is put into water, the water rises 1.4 $\mathrm{cm} .$ When the same tube is put into hexane, the hexane rises only 0.4 $\mathrm{cm} .$ Explain.When a thin glass tube is put into water, the water rises 1.4 $\mathrm{cm} .$ When the same tube is put into hexane, the hexane rises only 0.4 $\mathrm{cm} .$ Explain.

Key Concepts

Contact Angle

The contact angle is the angle at which a liquid interface meets a solid surface. It quantifies the wettability of the liquid on the given surface. A smaller contact angle indicates that the liquid wets the surface more effectively, which generally leads to a higher capillary rise. The difference in contact angles for different liquids, such as water and hexane in the same tube, helps explain why they exhibit different capillary behaviors despite being in the same physical setup.

Adhesive and Cohesive Forces

Adhesive forces are the attractions between different substances, like a liquid and a solid, while cohesive forces are the attractions between like molecules within the liquid. The balance between these forces determines the shape of the meniscus and the extent of capillary rise. For instance, when adhesive forces overcome cohesive forces, the liquid tends to spread along the surface, resulting in a concave meniscus and greater capillary rise, as observed with water in a glass tube.

Density of the Liquid

The density of the liquid is an important factor in determining the height of capillary rise, as it appears in the denominator of the capillary rise equation. A less dense liquid will tend to rise higher in a capillary tube compared to a denser liquid, assuming other factors like surface tension and contact angle remain similar. This variable helps explain differences in the capillary behavior of different liquids even when they are in contact with the same solid surface.

Capillary Action

Capillary action refers to the ability of a liquid to flow in narrow spaces without the assistance of external forces like gravity. This phenomenon occurs due to the interplay between cohesive forces within the liquid and adhesive forces between the liquid and the surrounding solid surface. It is a fundamental concept in fluid mechanics that helps explain how fluids interact in confined geometries, such as in a thin tube.

Surface Tension

Surface tension is the property of a liquid that allows it to resist an external force, due to the cohesive nature of its molecules. It plays a critical role in capillary action by influencing the curvature of the liquid’s meniscus in contact with a solid surface. A higher surface tension in a liquid typically results in a more pronounced capillary effect, as the liquid molecules tend to pull together more strongly, thereby affecting the height to which the liquid can rise in a tube.

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