There is no "empty" space in our universe. The quantum vacuum is the baseline energy level (the ground state) of the universe, so it is very difficult to detect. In order to measure the absolute magnitude of the vacuum, you would need access to a true vacuum with which to compare it, and there does not appear to be any way to produce a true vacuum - one that can somehow exclude quantum effects.Chronos said:What measurable property of empty space is there to be conserved? Only mass and energy are known to be conserved in this universe. Defining the properties of the vacuum is more difficult. Dark energy is the only current candidate, and it is difficult to quantify this property.
-Job- said:Saying vacuum has a given energy density, and that today we have more vacuum than yesterday may not imply that the universe contains more energy today than yesterday. If we say the universe had an area A yesterday and area B today, and if we know that this extra area B-A is new vacuum created due to the expansion of the universe, then we can only say that today we have the extra (B-A)*rho(vacuum) amount of energy in the universe if we assume that elsewhere the universe has the same energy distribution as yesterday, when in fact it's more likely that today's universe, though containing more vaccum, contains less matter or other forms of energy.
To go out on a limb here, consider the amount of radiation that is never absorved by matter, this energy will make it to the edge of the universe, hence if we observe the same area A of the universe over time we'll see that it must lose energy due to emissions of radiation. We might use the energy lost in this way to account for the energy in the new vaccum.
The concept of preservation of space refers to the idea that the universe and everything within it remains constant and unchanging over time. It suggests that space is not affected by the passage of time or any external forces.
There is currently no conclusive evidence to support the preservation of space. While the laws of physics suggest that space should remain constant, some theories and observations, such as the expansion of the universe, suggest that space may be changing over time.
There are various theoretical models that attempt to explain the preservation of space, such as the steady-state theory and the cyclic universe theory. However, none of these models have been proven to be accurate or widely accepted by the scientific community.
The Big Bang theory suggests that the universe began as a singularity and has been expanding ever since. This theory does not explicitly address the preservation of space, as it focuses more on the origins of the universe. However, some scientists argue that the expansion of the universe supports the idea of preservation of space, as it suggests that the overall structure of the universe remains constant despite its expansion.
Currently, there is no way to test or observe the preservation of space directly. However, ongoing research and advancements in technology may one day provide evidence for or against this concept.