[Bobsey (OP)]

A vacuum is a construct created by humans that sucks all the air out of a containment here on Earth .

It is said that the speed of light is c in a vacuum and I wondered if this has been tested in a vacuum ?

[alancalverd]

Yes, every time you use a GPS.

[Bobsey (OP)]

Yes, every time you use a GPS.

A GPS doesn't use a vacuum , it uses the spacing between things .

A vacuum is a human constuct of a containment with the air sucked out .

[Kryptid]

A vacuum is a human constuct of a containment with the air sucked out .

Vacuums aren't a human construct. The majority of the Universe is a vacuum. However, the speed of light has been measured in a man-made vacuum, if that's what you are asking.

[alancalverd]

A GPS doesn't use a vacuum , it uses the spacing between things .

....which are separated by a vacuum.

[Bobsey (OP)]

A vacuum is a human constuct of a containment with the air sucked out .

Vacuums aren't a human construct. The majority of the Universe is a vacuum. However, the speed of light has been measured in a man-made vacuum, if that's what you are asking.

That is all I was asking but the Universe isn't a vacuum , humans didn't make that I'm sure . It's not like there is some humans outside of what we see that have sucked all the air out of the space .
Thanks for your answer , question answered .

[Bored chemist]

but the Universe isn't a vacuum

Most of it is.
That's part of the reason they call it "space".

[Bobsey (OP)]

the Universe isn't a vacuum , humans didn't make that

A trivial google search says otherwise:
"The best vacuum ever constructed on Earth was done at CERN at reported to achieve a density of about 1000 atoms per cubic centimeter. While this is astonishingly low, it is still over 2 million times more dense than interstellar space!"
https://sites.coloradocollege.edu/pc357ml/2014/04/10/space-as-a-vacuum/#:~:text=The%20best%20vacuum%20ever%20constructed,more%20dense%20than%20interstellar%20space [nofollow]!

I googled vacuum and the defintion says ,
A vacuum is a space devoid of matter. The word is derived from the Latin adjective vacuus for "vacant" or "void". An approximation to such vacuum is a region with a gaseous pressure much less than atmospheric pressure. Wikipedia

I always thought a vacuum was a process of extracting the air from a containment . Are you saying the universe is contained or something similar ?

As well , when we suck the air out of a containment like CERN , isn't there still some sort of energy field in their like the earths magnetic field ? Does a compass work in a vacuum ?

[Bobsey (OP)]

but the Universe isn't a vacuum

Most of it is.
That's part of the reason they call it "space".

Is't space full of particels ? How can space be a vacuum ?

[alancalverd]

Vacuum is the space between particles. The universe contains a lot more space than particles.

[Bobsey (OP)]

A vacuum is a space devoid of matter.

A vacuum is a space devoid of matter according to google . Space contains planets and other matter , how can space be classed as a vacuum when it contains lots of matter ?

[Zer0]

Interesting & Amusing OP.
👍

Welcome to the Forum Bob!

[Kryptid]

A vacuum is a space devoid of matter according to google

The space between the particles is devoid of matter, hence a vacuum.

Welcome to the Forum Bob!

I don't think this is his first time here. Not by a long shot.

[evan_au]

I always thought a vacuum was a process of extracting the air from a containment . Are you saying the universe is contained or something similar ?

Actually, while it was forming, the baby Earth extracted any nearby atoms out of space by its gravitational field, interacting with the protoplanetary disk
- The same goes even more so for the Sun (mostly hydrogen and helium) and the large planets (Jupiter, Saturn, etc)

The Sun blows out a high-speed Solar Wind, but its density is far less than the density at the surface of the Sun.
- Since the surface of the Sun is strongly compressed by gravity into the sphere we see in the sky
- By the time this Solar Wind reaches the Voyager spacecraft, its density and speed have dropped enormously. In this region, the extremely low density of the interstellar medium dominates.

CERN uses very fancy vacuum pumps, but for most of space, gravity is the invisible "pump" which keeps the air out of space.

https://voyager.jpl.nasa.gov/mission/status/

[Bobsey (OP)]

I always thought a vacuum was a process of extracting the air from a containment . Are you saying the universe is contained or something similar ?

Actually, while it was forming, the baby Earth extracted any nearby atoms out of space by its gravitational field, interacting with the protoplanetary disk
- The same goes even more so for the Sun (mostly hydrogen and helium) and the large planets (Jupiter, Saturn, etc)

The Sun blows out a high-speed Solar Wind, but its density is far less than the density at the surface of the Sun.
- Since the surface of the Sun is strongly compressed by gravity into the sphere we see in the sky
- By the time this Solar Wind reaches the Voyager spacecraft, its density and speed have dropped enormously. In this region, the extremely low density of the interstellar medium dominates.

CERN uses very fancy vacuum pumps, but for most of space, gravity is the invisible "pump" which keeps the air out of space.

https://voyager.jpl.nasa.gov/mission/status/ [nofollow]

I have no idea of the science you mention . I am not understanding how a space that is't empty can be classed as a vacuum .
I think the word is contradictory ?

[Bored chemist]

There is no such thing as a perfect vacuum.
But the space between the stars + planets is a much better approximation to a vacuum than any ever produced by man.

[Bobsey (OP)]

There is no such thing as a perfect vacuum.
But the space between the stars + planets is a much better approximation to a vacuum than any ever produced by man.

I wasn't expecting weird answers , people are telling me that if one of my hands is empty and the other has coins in it , that is the same thing . A vacuum is empty of things , the space that contains millions of stars is't empty .
Am I missing something here ?
I think the word is volume ? An empty volume isn't the same as a volume with things in it ?

[Bored chemist]

Do you understand that a vacuum is impossible?

[alancalverd]

Fortunately for science and all rational humans, Bobsey's personal problems including his philosophical definition of a vacuum are of no importance.

[Origin]

Am I missing something here ?

Yes.