What is the name of the experiment of using a ruler to blot paper?

It's triboelectric activation.

The phenomenon of using friction to make two different objects charged is called triboelectric (or the phenomenon that after two different objects rub against each other, one object is positively charged and the other object is negatively charged). Triboelectric is the result of the transfer of electrons from one object to another. Therefore, when two uncharged objects are electrorically charged by friction, the amount of electricity they carry must be equal numerically.

Objects that have been rubbed have the phenomenon of attracting small and light objects. Two Charges: There are only two types of charges that exist in nature.

It is stipulated that the charge of the belt of the glass rod rubbed by the silk is called the positive charge, and the charge of the rubber rod that is rubbed with the fur is called the negative charge. Interaction between charges: The same charge repels each other, and the different charges attract each other.

Any two objects rubbing against each other can be electrified. In the mid-18th century, the American scientist Benjamin Franklin analyzed and researched that there are two kinds of electricity with different properties, called positive electricity and negative electricity. The electricity carried by an object due to friction is either positive or negative.

Scientifically stipulated: the same electricity carried by a glass rod rubbed with silk is called positive electricity; The same electricity as a rubber rod that has been rubbed with fur is called negative electricity.

The experimental principle of a piece of paper pressing down on a ruler: an experiment that uses the friction and pressure of the paper to verify the atmospheric pressure.

Experiment: The A4 paper is tightly wrapped around the atmospheric pressure, and the white paper occupies a large surface area, and the atmospheric pressure acts perpendicular to the surface of the white paper, so that it is tightly pressed on the table.

The various striking forces just now were not enough to overcome the atmospheric pressure, so the white paper was not pried up by the ruler.

Expansion of knowledge about atmospheric pressure:

Atmospheric pressure generally refers to air pressure. Barometric pressure is the atmospheric pressure acting on the area of a single ascendant, i.e., the gravitational force exerted on a vertical column of air that extends upwards to the upper boundary of the atmosphere per unit area.

Experiments on atmospheric pressure.

Principle: There is atmospheric pressure around the A4 paper. The atmospheric pressure acts vertically on the surface of the A4 paper, so that it is tightly pressed against the tabletop, and the larger the surface area, the greater the atmospheric pressure is subjected to the rattle.

The various striking forces in the experiment were not enough to overcome the atmospheric pressure, so the A4 paper was not cocked by the ruler. But when the force of the blow is large enough to exceed the atmospheric pressure to which the A4 paper is subjected, the ruler will fall.

Expansion: Atmospheric pressure is the atmospheric pressure acting on a unit area, that is, the gravitational force that is numerically equal to the vertical column of air that extends upward to the upper boundary of the atmosphere per unit area. The famous Magdeburg hemispheric experiment proves its existence.

The international unit of air pressure is Pascal, abbreviated as Pa, and the symbol is Pa. In meteorology, people generally use kilopascal (kpa) or hectopar (hpa) as the unit. The other commonly used single-yearling slots are:

bar (1 bar = 100,000 Pa) and a centimeter of mercury (or centimeters of mercury). Air pressure varies not only with altitude but also with temperature. Changes in air pressure are closely related to weather changes.

1.Fill a water cup with water2Then put the paper flat on the rim of the water cup 3

Hold down the hand of the paper and let go of the paper whether the paper has fallen off 7End of observation experiment.

The world of paper science to be able to hold water is wonderful. Now I'm going to do the experiment with the "water cup 'sucking' paper". First take out an ordinary glass, fill half a bottle of water, and then take out an ordinary white paper. Next, it's time to witness the miracle.

I saw that she pressed the paper on the cup, pressed it, and then gently, turned the cup, took her hand away from the paper, and grabbed the bottom of the cup, the strange thing is that the water in the cup did not flow out, and the paper grasped the cup firmly like an octopus. Oh my God, it's amazing why paper sucks on the cup.

Introduction to experimental precautions:

The water in the cup must be filled, and the paper must be tightly fitted with the cup, otherwise the water may leak out. The upside-down movement of the cup must be fast. It is best to operate this experiment by a friend by the pool, so as not to spill the water and stain the home environment if the experiment is not successful.