PHYSICAClass 11 Physics simulations · Mechanical Properties of Fluids
Pressure inside drops and bubbles
Surface tension squeezes a drop. A soap bubble has two surfaces, so its excess pressure doubles.
What to notice
Smaller drops and bubbles have a higher internal pressure.
Key relation
Drop: ΔP = 2T/r ; Bubble: ΔP = 4T/r
Try this
Make the radius ten times smaller.
What you can change
- Object: choose Liquid drop, Soap bubble, Air bubble inside liquid
- Radius: 0.1 to 50 mm
- Surface tension: 0.02 to 0.08 N/m
More in Mechanical Properties of Fluids
- Lift on an aerofoil
- Float or sink?
- Capillary rise and depression
- Flow through a narrowing pipe
- Hydraulic lift (Pascal)
- Pressure at depth in a tank
- Viscous drag and terminal speed
- Water jet from a tank
- Venturimeter
See all Class 11 Physics simulations or every Physica simulation.