critical density

noun Physics.
the density of a pure element or compound at a critical point. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
critical density
the density of matter that would be required to halt the expansion of the universe

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
If the universe was below that critical density, it would continue expanding forever.
Quorum sensing enables bacteria to change their behaviour once they reach a critical density.
Also when gravity reaches critical density, it ignites and releases energy as light.
It wasn't enough to say that the universe was accelerating, only that there wasn't enough matter to provide the critical density.
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