Question

I would like to know if it was possible to make an object appear or disappear in a room what would happen with the addition of subtraction of this mass? If it was the size of a human would it cause a shockwave/explosion if it appeared and cause a black hole if it disappeared?

Answer 1

Answer to Question #69749, Physics / Molecular Physics | Thermodynamics

Question:

I would like to know if it was possible to make an object appear or disappear in a room what would happen with the addition of subtraction of this mass? If it was the size of a human would it cause a shockwave/explosion if it appeared and cause a black hole if it disappeared?

Solution:

Generally speaking it is impossible for something to appear or disappear in the real world due to several reasons.

First there is a law of energy conversion, which state that the energy in the closed system cannot appear or disappear by no reason, and as we know from the Einstein's equation

$$E = m c ^ {2}$$

mass "is" energy. However the "vacuum" is full of different fields, gravitational, electromagnetic and so on so in principal matter can appear "from nowhere" and it does, it just does it on a Nano scale (for instance an electron-positron pair can appear in "vacuum"). Moreover the process also has to satisfy the other conversion laws:

Conservation of electric charge, conversion of angular and linear momentum, conversion of color charge and so on.

This particle pairs are created constantly and annihilate with each other all the time, but as the total energy is constant in the small region where it happens we do not even notice it.

Now let's imagine that there exists such a "supper mater" that is characterized only by mass (has no charge, no spins, nothing), and let's imagine it can be created out of energy directly (THIS IS IMPOSIBLE).

When a body of this sort will be created it will consume an enormous (mass*300000000² J) amount of energy so when such a body appears everything around should frizz. There will be no explosion, in contrary an explosion will be consumed by the body creation.

Now when the body disappears – the energy will be produced, and an explosion will happen. This is what is going on when the nuclear bomb explodes, a small (very small) fraction of mass of Uranium due to nuclear reaction is converted to energy, and nuclear bombs are very powerful.

Black holes are very massive objects, they have nothing to do with this hypothetical situation

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