For example, in Maxwell's theory of electromagnetism, a vacuum solution would represent the electromagnetic field in a region of space where there are no electromagnetic sources (charges and electric currents), i.e. where the current 4-vector vanishes:
Another example is Einstein's theory of general relativity where a vacuum solution would represent the gravitational field in a region of spacetime where there are no gravitational sources (masses), i.e. where the energy-momentum tensor vanishes:
Fabrication of Stainless Steel Vacuum Chamber with Vacuum Solution. Dimensionl 100cm X W 40cm X H 60cm. (Detailed Specification Attached. Please Contact Dr. Cheah Kean How at 67906084 or 91008135 If Y
Aug 28, 2013; Contract awarded for Fabrication of stainless steel vacuum chamber with vacuum solution. Dimensionl 100cm x w 40cm x h 60cm....