有關汽車駛過後風速一問

When a car is travelling at high speed, it creates a partial vacuum behind it. After it has passed, air will move in the direction of the moving car to fill up the partial vacuum. This is the reason why you feel a wind blowing at the travelling direction of a passing car.
The magnitude of a partial vacuum depends on a number of factors, apart from the speed of the car, the dimension and geometry of the car also plays an important role. This requires complex aerodynamics calculations to determine the wind speed.

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