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2 cards from this section. Quick, good the night before a test.
What shape do liquid drops take when gravity is negligible?
Think about the least surface area possible.
What causes the pressure difference in drops?
Consider the forces acting at the surface.
Why are liquid drops spherical in shape when a gravity is negligible?
Think about energy efficiency.
Is the pressure inside a bubble greater than outside?
Consider the effects of surface tension.
Calculate the radius of a spherical drop if the internal pressure is 3000 Pa, and surface tension is 0.06 N/m.
Rearrange the formula to find the radius.
Explain how the pressure inside a bubble changes when it merges with another bubble. What physical principles apply?
Consider how merging volumes relate to pressure and surface tension.
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