Vacuum: Difference between revisions
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<onlyinclude>'''Vacuums''', such as the vacuum of space, contain no matter of any type.</onlyinclude> Usually, one thinks of the vacuum as having no [[atmosphere]] | <onlyinclude>'''Vacuums''', such as the vacuum of space, contain no matter of any type.</onlyinclude> Usually, one thinks of the vacuum as having no [[atmosphere]] (essentially negligible pressure) but there's a lack of [[solid]]s or [[liquid]]s as well.<ref>Law and R. Rennie, A dictionary of physics. Oxford: Oxford University Press, 2015.</ref> The vacuum does however often contain [[photon]]s. This doesn't stop it from being a vacuum, because photons do not contain [[matter]]—just [[energy]]. This is how the vacuum can ''still exist at some [[temperature]] above [[absolute zero]]'': the photons allow it to have that [[thermal energy]] without having matter. See Figure 1 to see the vacuum of space. | ||
[[File:ISS023-E-57948_lrg.jpg|thumb|800px|center|Figure 1. A picture of the atmosphere taken from the International Space Station over the Indian Ocean, the black in the upper right hand side is the vacuum of space.<ref>NASA, accessed: https://earthobservatory.nasa.gov/images/44267 on August 26th, 2018.</ref>]] | |||
==For Further Reading== | |||
*[[Matter]] and [[Energy]] | |||
*[[Atmosphere]] | |||
*[[Thermal energy]] | |||
*[[Photon]] | |||
*[[Absolute zero]] | |||
*Or explore a [[Special:Random|random page]] | |||
==References== | |||
{{reflist}} | |||
[[Category:Uploaded]] | [[Category:Uploaded]] |
Revision as of 20:54, 26 August 2018
Vacuums, such as the vacuum of space, contain no matter of any type. Usually, one thinks of the vacuum as having no atmosphere (essentially negligible pressure) but there's a lack of solids or liquids as well.[1] The vacuum does however often contain photons. This doesn't stop it from being a vacuum, because photons do not contain matter—just energy. This is how the vacuum can still exist at some temperature above absolute zero: the photons allow it to have that thermal energy without having matter. See Figure 1 to see the vacuum of space.
For Further Reading
- Matter and Energy
- Atmosphere
- Thermal energy
- Photon
- Absolute zero
- Or explore a random page
References
- ↑ Law and R. Rennie, A dictionary of physics. Oxford: Oxford University Press, 2015.
- ↑ NASA, accessed: https://earthobservatory.nasa.gov/images/44267 on August 26th, 2018.