Timeline for How can pressure act in both the up and down direction?
Current License: CC BY-SA 4.0
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| Aug 30, 2018 at 22:41 | comment | added | JEB | I like the air quotes in a scalar is "just a number", since it's not just a number, esp. in regards to this question. As the rotationally invariant part of the stress tensor (the trace), it's a number that is also a geometric object--the simplest geometric object, but a geometric object nonetheless. | |
| Aug 30, 2018 at 20:20 | history | answered | probably_someone | CC BY-SA 4.0 |