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Chapter 2: Problem 80

Slowly fill a glass with water to the maximum possible level. Observe the water level closely. Explain how it can be higher than the rim of the glass.

Short Answer

Expert verified
The water level can go higher than the glass rim due to surface tension, combined with the adhesive forces between glass and water. These factors come together, allowing the water to form a dome-like shape above the rim rather than spilling over immediately.

Step by step solution

01

Observation

Begin by filling the glass with water till it reaches the rim. Carefully keep adding water drop by drop and observe how the water level rises above the rim of the glass without spilling over.
02

Understanding Surface Tension

Surface tension is a property of liquid that enables it to resist an external force, due to the cohesive nature of its molecules. Water exhibits high surface tension, which is why the water doesn't immediately spill over the rim, when filled up to its top.
03

Analysing the Phenomenon

The phenomenon is caused by the adhesive force between water and glass, which lets water climb up the sides of the glass, and the cohesive forces within the water itself, which work to maintain the integrity of the water's shape. The combination of these cohesive and adhesive forces creates a 'dome' of water above the rim.

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Most popular questions from this chapter

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