I will start with an excuse, sorry english is not my main lenguage and i dont practice grammar that much, it is my first time in these forums so be kind, i hope i posted on the right forum thank you for the comprehension. When you move your arm for example do you generate a trail of vacuum behind it? and does the air ocupating the vacuum space generate force? I got as especific is i could get if you need anymore values for the calculations ask,i can give preety much anything. How would you calculate: What would be the nescessary velocity for a 60cm³ random body part of you (volume) to generate enough vacuum so the air ocupating it space would generate 78 megapascal of pressure on a circle of 3 meter radius?