Originally Posted by Try2B Comprehensive
I think of it as: there is no such thing as nothing. Space sort of is an ether after all, with it's infinitesimal mass. I wonder though- if a portion of outer space were shielded from radiation, would that 'empty space' still have an effective mass?
One thing. There is no portion of space completely shield from radiation.
And the second thing. Empty space is never completely empty. Due to vacuum fluctuations, also called quantum fluctuations, there are always particles in empty space - they pop in an out of existence. So, in a cubic metre of empty space, there's always roughly at least one hydrogen atom worth of mass.
Anyway, I was thinking of a Higgs boson. I don't really know what it is though, or if temperature applies to it. And the whole question becomes perplexing, since space turns out to have mass and these particles don't
Not many people know what a Higgs boson really is. The maths is too hard.
Temperature is not a thing in itself. It's a measurement of something. It's actually a measurement of two things that happen, and lead to the effect of either heat or coldness.
One thing is the movement of atoms and molecules - the faster they move, the hotter they seem to a thermometer or us - it's actually their movement and when they bang off things like each other. They literally bang off each other like ping pong balls.
The second thing is radiation/light. Atoms banging off each other creates light (it's one way light/radiation is created) Radiation/light can also nudge and push atoms around, causing them to go faster.
The atoms themselves are neither hot nor cold. They're either moving fast or slowly. We experience the speed and force of these atoms as heat - or cold if they're moving slowly.
We also experience sunlight as warmth - because when it hits the atoms on our skin it causes them to move.