{"id": "card_floor_thermodynamics", "kind": "note", "title": "Thermodynamics — the arrow and the one end", "body": "The four laws. The first law is energy conservation (Noether's energy, now counting heat and work). The second law - entropy never decreases - is the one place physics is not time-reversible: the arrow of time, the one-way flow, the engine of 'the story ends the same way' (of the many microstates almost all reach the one maximum-entropy macrostate). Four pillars rest on the floors already seeded: the first law (on Noether), the second law (on the capstone), statistical mechanics (on the Hamiltonian), and entropy = information (on the instruments). The stick (stick_thermodynamics_the_arrow_and_the_one_end) seals the Carnot bound and the first-law balance; the second-law/Landauer and Boltzmann/Bekenstein seals are cited (tools/seed_thermodynamics.py).", "source": {"label": "Narrow Highway — thermodynamics", "url": "", "authority_tier": "engine_derived", "ref": "stick_thermodynamics_the_arrow_and_the_one_end"}, "shelf": "codex", "box": "thermodynamics", "bands": ["floor", "thermodynamics", "entropy", "arrow of time", "second law", "quantum", "one map"], "subject": "Thermodynamics — the arrow and the one end", "connections": [{"to_card_id": "card_thermo_first_law", "relationship": "has_part", "evidence": "a law of thermodynamics (The first law)"}, {"to_card_id": "card_thermo_second_law", "relationship": "has_part", "evidence": "a law of thermodynamics (The second law)"}, {"to_card_id": "card_thermo_statistical_mechanics", "relationship": "has_part", "evidence": "a law of thermodynamics (Statistical mechanics)"}, {"to_card_id": "card_thermo_entropy_information", "relationship": "has_part", "evidence": "a law of thermodynamics (Entropy is information)"}, {"to_card_id": "card_k_floor_of_discovery", "relationship": "part_of", "evidence": "the arrow of time on the one map"}, {"to_card_id": "card_chem_reaction_direction", "relationship": "connects_at", "evidence": "Delta G = Delta H - T Delta S decides which reactions run - the second law"}, {"to_card_id": "card_pchem_equilibrium", "relationship": "connects_at", "evidence": "the equilibrium constant is set by the free energy: Delta G = -RT ln K"}, {"to_card_id": "card_bio_metabolism", "relationship": "connects_at", "evidence": "life is a local entropy decrease paid for globally - the second law, not broken"}, {"to_card_id": "card_earth_plate_tectonics", "relationship": "connects_at", "evidence": "mantle convection is a heat engine - plate tectonics runs on the second law"}, {"to_card_id": "card_mind_expensive_brain", "relationship": "connects_at", "evidence": "the brain's energy budget - a local order paid for by the second law"}], "author": "engine", "created_at": 0.0, "updated_at": 0.0, "visibility": "public", "lifecycle_stage": "public", "volatility": "permanent", "surface": "secular", "generated": false, "call": "codex.thermodynamics", "facets": {"subject": ["arrow of time", "entropy", "floor", "one map", "quantum", "second law"]}, "presentation": {"glyph": "•", "kind_label": "thermodynamics", "by": "Narrow Highway — thermodynamics", "authority": "engine_derived", "posted": "", "standing": ""}, "neighbors": [{"id": "card_thermo_first_law", "title": "The first law — energy is conserved", "relationship": "has part", "why": "a law of thermodynamics (The first law)", "href": "/card/card_thermo_first_law", "resolved": true}, {"id": "card_thermo_second_law", "title": "The second law — entropy increases, the arrow, the one end", "relationship": "has part", "why": "a law of thermodynamics (The second law)", "href": "/card/card_thermo_second_law", "resolved": true}, {"id": "card_thermo_statistical_mechanics", "title": "Statistical mechanics — many microstates, one macrostate", "relationship": "has part", "why": "a law of thermodynamics (Statistical mechanics)", "href": "/card/card_thermo_statistical_mechanics", "resolved": true}, {"id": "card_thermo_entropy_information", "title": "Entropy is information — Boltzmann, Shannon, Landauer", "relationship": "has part", "why": "a law of thermodynamics (Entropy is information)", "href": "/card/card_thermo_entropy_information", "resolved": true}, {"id": "card_k_floor_of_discovery", "title": "The Floor of Discovery — one floor, and by its design the fear of God", "relationship": "part of", "why": "the arrow of time on the one map", "href": "/card/card_k_floor_of_discovery", "resolved": true}, {"id": "card_chem_reaction_direction", "title": "Reaction direction — Gibbs and the second law", "relationship": "connects at", "why": "Delta G = Delta H - T Delta S decides which reactions run - the second law", "href": "/card/card_chem_reaction_direction", "resolved": true}, {"id": "card_pchem_equilibrium", "title": "Equilibrium — Delta G = -RT ln K", "relationship": "connects at", "why": "the equilibrium constant is set by the free energy: Delta G = -RT ln K", "href": "/card/card_pchem_equilibrium", "resolved": true}, {"id": "card_bio_metabolism", "title": "Metabolism — life runs on free energy", "relationship": "connects at", "why": "life is a local entropy decrease paid for globally - the second law, not broken", "href": "/card/card_bio_metabolism", "resolved": true}], "house": {"door": "FIND", "kind": "card", "trail": "connections", "seal": "/card/card_floor_thermodynamics", "next_step": {"do": "follow a connection: what this card rests on, and what rests on it", "door": "FIND", "tool": "card_connections", "params": {"id": "card_floor_thermodynamics"}}, "ends": "a verdict or a card · the trail · a seal · one next step"}}