Blutdruck verstehen: Die faszinierende Physik hinter mmHg

This video is about blood pressure and blood pressure measurement. To truly understand both, you need to know the physics behind them. For example, how does a blood pressure measurement work technically? Why is blood pressure measured in mmHg? Why are there two values? And why are astronauts positioned upside down to prepare for weightlessness? But the mother of all blood pressure questions goes like this: Ideal blood pressure is 120/80 mmHg. Normal atmospheric pressure, measured in the same unit, is 760 mmHg – much higher. So why does blood still spurt out when an artery is injured? Shouldn't air actually be forced into our bodies due to the increased pressure?