How many blows are needed to inflate a 2 meter long bag? These 2 meter (8′) long blow-up bags will help you discover what the Bernoulli principle is through experimentation and with a simple technique you will be able to inflate it in one blow! Light and strong bags that even the little ones can inflate! 1 unit includes 4 bags (1 green, 1 red, 1 yellow, 1 blue). Use Simply tie a knot at one end. You can then try to inflate the bag without revealing the scientific trick (people usually stick their mouth on the bag to prevent the air from coming out). Bernoulli’s principle states that the speed of a moving air stream is influenced by pressure. If you blow into the center of the bag, a good distance from the opening, you create a high-pressure stream in the center, but around it the pressure is lower, which attracts the surrounding air to follow, greatly increasing the volume of air entering the bag.
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