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Apr 9, 2018 at 11:51 comment added JMac It's not clear to me what we consider "rigid" and what we consider a "flexible solid" in this context. No solid will be perfectly rigid; and we know that this particular solid can experience thermal expansion. A donut shaped balloon isn't really a physical analog for thermal expansion; so the example doesn't really show much.
Apr 7, 2018 at 8:08 history answered Robert CC BY-SA 3.0