Ask everyone a physics question, my younger brother just graduated from junior high school and has n

As the temperature increases, the spacing between gases increases, i.e., the density decreases. But since the balloon is sealed, the gas cannot escape. Its mass does not change, but its density decreases, so the volume of the gas becomes larger. The pressure will be greater than the outside world. So the balloon will become bulging.

There is a premise that the air pressure will be reduced if the density is reduced! The temperature does not change.

The colabolon equation is pv=nrt, and n=m m, m is the mass of the substance, m is the molar mass, and the equation becomes "pm=rt*density".

It can be seen that the pressure is the same as the product change of density and temperature.

You can simply understand that after the temperature rises, the gas molecules gain energy, and their activity is stronger than that of the gas molecules whose temperature does not change outside the plastic bag, so the plastic bag is stretched...

So look at who plays a major role in the change in density and temperature.

PV t = constant value, P pressure, V volume, T Kelvin temperature. It's because the temperature has also risen.

In fact, this one is relative. In reality, we are walking, swinging our arms, etc., all the time rubbing. Even if there is no large movement, when we sit, there will be a flow of air, and there will be slight friction

Or when we come into contact with something else, that electricity disappears. To put it simply, this thing exists all the time, but it also disappears all the time.

For example, when you take off your sweater in the winter, there is a spark because it is electrified. And this electricity dissipates with the air, or with your body, or anything around you that can be touched, including air. It's like smell.

And if in an absolutely ideal environment. Suppose, no air, no light, no conductors, absolute vacuum. Electricity is not conducted. Will be there all the time, as you say.

It is ideal to stop rubbing against other objects with it, and it is impossible to achieve. Assuming that it is possible, it will always be electrically apparent.

Electrical neutralization is a steady state in nature, and being charged in the natural environment (without human influence) is a temporary state. Therefore, if there is no human influence, the charged object must return to an uncharged (electrically neutralized) state, and the lost electrons are compensated from the ions in the air, and the ions in the air are thus changed to atoms or molecules. Neutrality is also a fundamental law of nature.

Theoretically, yes. But in reality, the power is constantly being consumed because of contact with the surrounding environment. So a tiny charge will eventually be uncharged.

No, because it doesn't exist in an ideal world, there's no friction, but the reality is that it's also possible for it to rub against other objects, which may lead to more charges on other objects and become uncharged.