2.9 - Surface Tension
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Practice Questions
Test your understanding with targeted questions
Define surface tension.
💡 Hint: Think about how molecules at the surface interact compared to those below.
What happens to surface tension as temperature increases?
💡 Hint: Consider the effect of molecular motion on cohesive forces.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is surface tension?
💡 Hint: Think about why water droplets keep a rounded shape.
Temperature increases surface tension.
💡 Hint: Consider the kinetic theory of matter.
2 more questions available
Challenge Problems
Push your limits with advanced challenges
Given a liquid with a surface tension of 0.07 N/m and a droplet radius of 0.5 mm, how much force is required to pull two plates apart that are coated with this liquid?
💡 Hint: You'll need to find the area (A) of the coating to continue.
If the temperature of a liquid increases from 20°C to 80°C, causing surface tension to drop from 0.07 N/m to 0.045 N/m, calculate the change in pressure difference across a bubble with a radius of 0.3 mm before and after.
💡 Hint: Use the initial and final values for surface tension in the pressure difference calculation.
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