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  1. When a body moves through space filled with air, then higher pressure is created in front of it, while lower pressure (depressure) behind it. The higher pressure is PLUS, the lower pressure is MINUS. I use to call this a ‘principle of an arrow’ (− >—> +) (click on the images for a bigger view). The greater the velocity of the body is, the stronger is the plus in front of it as well as the minus behind it. This principle can be found in many things, among others also in the so-called “Bernoulli’s principle”. What is “Bernoulli’s principle” in its basic form? The picture below shows it.
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