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abstraction > mathematical concept > number > quantity > density > critical density |
critical density comparison table |
Subject | is a kind of | has definition |
---|---|---|
density | quantity | An object's mass divided by its volume. Cotton has a low density; lead has a high density. Red giants have a low density; white dwarfs have a high density. |
critical density | density | If the cosmological constant is assumed to vanish, then the critical mass density is that density which puts the universe just on the border between eternal expansion (open universe) and eventual collapse (closed universe). |
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