When dust is carried on air currents generated by air conditioning and similar devices, the dust takes on a positive or negative static electric charge due to contact with various objects. Dust that has a positive electric charge will be attracted to objects that have a negative electric charge, and vice versa. The greater the amount of dust in the air, the larger the amount of dust that clings to objects within the room.
此外，如果灰尘（主要是人和衣服）的电荷是电荷的，则来自这些来源产生的灰尘也是电荷的。通过静电产生的这种吸引力被称为“库仑力”。库仑力由下式表达：

Where F [N] is the Coulomb force, Q1 and Q2 [C] are electric charges, d [m] is the distance between the electric charges, and ε0 [F/m] is the electric constant (ε0 = 8.85 × 10-12 F/m) The Coulomb force is stronger when the amount of static electricity present in the objects is larger, and is weaker as the distance between the objects becomes greater. If the distance is multiplied by 2, the Coulomb force becomes 1/4 of its previous value. If the distance is multiplied by 10, the Coulomb force becomes 1/100 of its previous value. This means that the force that acts between two objects separated by 1 mm 0.04" is reduced to 1/100 of its previous strength when the objects are separated by 10 mm 0.39".

We calculated the distance at which two spheres that are charged as much as possible begin to cling together due to the Coulomb force.

距离显示在水平轴上，垂直轴上显示库仑力。三条线表示每个具有不同粒径的示例。三种类型的颗粒的直径为0.5μm0.02密耳，5μm0.20密耳，50μm1.97密耳。让我们专注于指向A，B和C.这些点表示作用在颗粒上作用在颗粒上的重力之间的库仑力的强度的距离处于平衡状态。这意味着如果颗粒彼此靠近该距离，则它们将由于库仑力而不是重力而牢固地固定在一起。如果距离大于点指示的距离，则重力将取代库仑力，这将导致颗粒落到地面而不彼此紧固。在小于0.1mm 0.004“的距离下彼此相互吸引5μm。在大于或等于0.1mm 0.004”的距离处，颗粒落到地上而不彼此紧固。
这样，可以理解的是，当它们被极短距离分开时，颗粒仅彼此固定。

库仑力的大小也通过静电的量来改变。换句话说，库仑力的强度取决于物体被带有静电的物体。因为颗粒具有少量的静电，所以它们仅在短距离一起粘合在一起。让我们考虑一下灰尘和物体的情况，用静电充电。物体比灰尘大得多，因此物体具有更大的静电。而且，如果物体很大，则衰减库仑力的方法不再与距离的平方成反比。我们省略了详细的计算，但如果物体被充电充电，可能会吸引距离几十厘米的距离。

接下来,让我们考虑的对象is not electrically charged but the piece of dust is. In this case, it is necessary to consider one more condition: the conductivity of the object. First, consider a conductor. When the electrically charged piece of dust approaches the conductor, an electric charge with the opposite polarity of the static electricity of the piece of dust is drawn out from the side of the conductor close to the piece of dust. This is caused by the movement of electric charges within the conductor. This phenomenon is called electrostatic induction.

接地物对象不起作用作为这种现象的对策。这样做不会阻止由于库仑力而被抽出的相反电荷的现象。唯一的对策​​是消除静电从灰尘。导体和灰尘的表面具有相反极性的电荷，因此产生库仑力。
As before, we calculated the distance at which a piece of dust is attracted to an object.

对于直径为5μm的颗粒，该颗粒为0.20密耳，库仑力变得强，颗粒在0.1mm 0.004“或更低的距离处的物体上。给出一些余地，如果它们是以至少几毫米分开。
然而，只有电荷的灰尘是电荷的，电荷很小，因此库仑力较弱，灰尘紧贴到物体的距离短，只需几毫米。

接下来,让我们考虑的对象is an insulator that is not electrically charged and only the piece of dust is electrically charged. Insulators do not pass electricity. Therefore, electrostatic induction does not occur. In the Coulomb force formula given earlier, Q1 is zero, so the Coulomb force is also zero. In other words, the dust does not cling to the object.

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