Part 2: Bernoulli, pressures, buoyancy in detail
This chapter deals with the physical basics. If you are interested in physics in general, you should of course read it through. If you were at war with physics classes at school, you should read it even more.
It doesn't work without physics
The pressure of the surrounding fluid, for example gas, air or water, always acts on an object. When the object is at rest, it is only the static pressure. When the object moves, there is additional dynamic pressure against the direction of movement due to the movement. The static pressure decreases perpendicular to this direction. All in all, static and dynamic pressure always act together on an object - the two together add up to the total pressure.
According to Bernoulli, the total pressure continues p a fluid such as gas, air or a liquid composed of static and dynamic pressure. p is derived from the English word "pressure" for the German word "Druck". This total pressure can be regarded as constant under certain assumptions:
pgesamt = pdynamic + pstatic = constant
The dynamic pressure is the pressure generated by the movement of a fluid (gas, air, water) and acts in the direction of flow. For example, if you hold an umbrella in the wind, you will feel the dynamic pressure of the moving air.