# In Defence of Dualism

**URL:** <https://boards.straightdope.com/t/in-defence-of-dualism/832962>\
**Category:** Great Debates\
**Created:** [April 24, 2019, 12:18am UTC](https://boards.straightdope.com/t/in-defence-of-dualism/832962 "2019-04-24T00:18:39Z")\
**Posts on this page:** 1\
**Showing post:** 210

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**Author:** ![Max\_S](https://avatars.discourse-cdn.com/v4/letter/m/46a35a/32.png) [@Max\_S](https://boards.straightdope.com/u/Max_S)\
**Post date:** [April 27, 2019, 6:27pm UTC](https://boards.straightdope.com/t/in-defence-of-dualism/832962/210 "2019-04-27T18:27:13Z")

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> [@eschereal](#):
>
> In fact, I suspect large-scale violations occur with relative frequency. If you have a 5000K star orbiting an 8000K star, the colder one will emit radiant heat that will be absorbed by the hotter one. The net heat flow will be toward the colder one, but the hotter still receives some heat from it.

Simultaneous heat flow from the warm star to the cold star or even radiation to outer space would qualify as “some other change, connected therewith, occurring at the same time”.

Even if you are using Carathéodory’s principle with Planck’s principle, there is still no violation. A (closed) system consisting of two cold stars in space is not adiabatically accessible from a system consisting of a warm star and a cold star in space. A warm star cannot turn into a cold star without suffering some transfer of heat or energy, either to the cold star or to space.

~Max

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