B4
Pressure, fluids and flotation

• How to walk on the snow
• When a force is distributed on a surface
• The footprints
• Footprint depth
• The concept of pressure
• Pressure: a new physical magnitude
• The non-precision of common language
• Knives, nails, thumbtacks and so on
• Pressure and liquids
• How to apply a force to a liquid
• How to apply a force to a gas
• Pressure in liquids
• When the pressure in a liquid is generated by its weight
• The specific weight
• A property of pressure generated by the weight of a liquid
• Two applications of Stevin’s law
• Atmospheric pressure
• Archimede thrust
• The principle of Archimede
• Floating