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3 cards from this section. Quick, good the night before a test.
Define surface tension.
Think about how molecules at the surface interact compared to those below.
What happens to surface tension as temperature increases?
Consider the effect of molecular motion on cohesive forces.
What is surface tension?
Think about why water droplets keep a rounded shape.
Temperature increases surface tension.
Consider the kinetic theory of matter.
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?
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.
Use the initial and final values for surface tension in the pressure difference calculation.
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