2B20. Static Pressure
2B20.10 Pressure Independent of Direction
2B20.40 Hydrostatic Paradox, Pascal's Vases
2B30. Atmospheric Pressure
2B35. Measuring Pressure
2B40. Density and Buoyancy
2B40.10 Loss of Weight in Water, Archimedes' Principle
2B40.29 Lift an air filled balloon with a HE balloon: see 4E10.20 Balloon in Liquid Nitrogen
2B40.70 Lifting Power of Balloons
2B60. Siphons, Fountains, Pumps