00:10
00:09
00:08
00:07
00:06
00:05
00:04
00:03
00:02
00:01
| the property of matter by which it retains its state of rest or its velocity along a straight line so long as it is not acted upon by an external force |
| to be reflected many times, as sound waves from the walls of a confined space |
| critical density | |
| —n | |
| the density of matter that would be required to halt the expansion of the universe | |