Talk:Free space

From Wikipedia, the free encyclopedia

	Physics Portal This article is within the scope of WikiProject Physics, which collaborates on articles related to physics.
???	This article has not yet received a rating on the assessment scale. [FAQ]
???	This article has not yet received an importance rating within physics.
Help with this template Please rate this article, and then leave comments here to explain the ratings and/or to identify the strengths and weaknesses of the article.

[edit] difference between Patent office and technical definition

I thought it would be obvious but " the atmosphere, the ocean, or the earth" are not free of matter. Whether or not something is a good approximation to free space depends on the wavelength, for example, the earth is far from free space for visible light. Salsb 15:01, 7 December 2005 (UTC)

Thanks ... I would guess also that the "vacuum" of space (which contains a small proportion of elements) could be a approximation to "free space". J. D. Redding

True, but a incredibly much better approximation for all wavelengths. In terms of density, comparing outer space to air is like comparing a neutron star to a medium vacuum! Salsb 16:42, 7 December 2005 (UTC)

I don't think I did make such a comparision. Anyways ... nothing is totally "free of matter" and, more importantly, this is in the article. Sincerely, J. D. Redding 17:03, 7 December 2005 (UTC)

    --just remember..fuck yourself