Okay, scepti, could you please explain to me the following:
I have (personally) used a machine, for simplicity let us call that machine a vacuum chamber.
When I put an air balloon in it and turn it on, the balloon expands.
It expands because the pressure is being allowed to release by a lower pressure pathway opening up for them to expand into.
The pump provides this by compressing the atmosphere externally to the chamber.
When I put a marshmellow inside, it expands.
It expands because the air pockets inside the marshmallow are less dense. Basically they (as above) can expand because they're allowed to by their own decompression.
When I put water in it, it begins to boil, when I take it out it is still cold.
That's because it wasn't hot in the first place. It expanded due to low pressure being created (as above) and appeared to boil but was simply expanding the molecules to such a low pressure that they hardly agitated in a dense motion due to the expansion of those molecules.
It's a cold bubbling not a hot boil.
These oberservations are only explainable (to me) the following way: The vacuum chamber sucks the air out and creates an environment of low pressure.
No air gets sucked out, ever.
The atmosphere inside the chamber expands out of the chamber by the aid of a pump that pushes external atmosphere away from the opening of that chamber to allow out the molecules through natural expansion from their compressed state.
Now I hang a block of iron on a spring, when I turn the machine on nothing changes. I conclude that the weight of the iron block did not change.
You can only check this by putting in a set of scales and testing this out but you have to also be mindful of what is really going on, as in you place the scales inside the chamber that are calibrated in sea level (possibly) atmospheric pressure. You now allow release by expansion of molecules out of the chamber which includes those that are part of the calibration of the scales.
The same goes for the iron but you cannot visually see the change.
You can see it with a balloon or a marshmallow, etc but iron is much more densely compacted.
Where am I wrong?
Where do you think you could be wrong?