Under normal pressure and tension environments are a small fraction of the total energy density (including the rest mass). The negative vacuum pressure is enormous and the absolute value is equal to the energy density. And in this unusual property lies an important difference from the usual vacuum environment. When the observer begins to move in this environment, it would run against the flow of energy that is associated with the energy density, and, seemingly, the observer can measure the flow (this will be the "wind"). But, apart from this stream will flow to the observer as a stream of energy that is associated with negative pressure. This thread will be the sign of a negative, but in absolute value equal to the first stream and accurately compensate him. As a result, no "wind" will not be! No matter how the moving observer on inertia, it will always measure the same vacuum energy density (if any), and the same negative pressure, and no "wind", associated with the movement, will not occur. The vacuum is the same for all observers moving relative to each other mechanically.
Early Flying Machines
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