Equation 19 · Part 2 · The Arrow of Time and the Engine of Evolution
Symbol T_out
What this part means
ut is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Its job in the formula
ut is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Full expression→Symbol T_out→Article meaning
The passage around this formula
Kleidon’s framework treats this temperature drop the way an engineer treats any heat engine’s hot and cold reservoirs: the Carnot limit sets an absolute ceiling, ( - )/ , on what fraction of the incoming energy flux could in principle be converted to usable work rather than simply thermalized, and almost none of Earth’s actual energy conversions get anywhere near that ceiling — atmospheric convection and the hydrologic cycle…
Learn the underlying idea
A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.
Open the illustrated subscripts: which member of a family? guide →
See this notation across published equations →
Sources cited in the surrounding passage
- [13] Working at the limit: a review of thermodynamics and optimality of the Earth system ↗
- [14] What limits photosynthesis? Identifying the thermodynamic constraints of the terrestrial biosphere within the Earth system ↗
These citations provide research context; check each source for the exact claim it supports.