{"id": "card_floor_materials_science", "kind": "note", "title": "Materials science — how atoms pack and solids behave", "body": "Crystals pack with a definite efficiency (the FCC factor 0.74); solids deform by Hooke's law; and whether a solid conducts is set by its electron bands. Three pillars rest on chemistry (the lattice), physical chemistry (mechanical and phase behaviour) and quantum mechanics (the bands). The stick (stick_materials_science_how_atoms_pack_and_solids_behave) seals the packing factor and an elastic strain (tools/seed_materials_science.py).", "source": {"label": "Narrow Highway — materials science", "url": "", "authority_tier": "engine_derived", "ref": "stick_materials_science_how_atoms_pack_and_solids_behave"}, "shelf": "codex", "box": "materials_science", "bands": ["floor", "materials science", "crystallography", "solid state", "one map"], "subject": "Materials science — how atoms pack and solids behave", "connections": [{"to_card_id": "card_mat_lattice", "relationship": "has_part", "evidence": "a pillar of materials science (The lattice)"}, {"to_card_id": "card_mat_mechanical", "relationship": "has_part", "evidence": "a pillar of materials science (Mechanical behaviour)"}, {"to_card_id": "card_mat_electronic", "relationship": "has_part", "evidence": "a pillar of materials science (Electronic behaviour)"}, {"to_card_id": "card_k_floor_of_discovery", "relationship": "part_of", "evidence": "the science of solids on the one map"}], "author": "engine", "created_at": 0.0, "updated_at": 0.0, "visibility": "public", "lifecycle_stage": "public", "volatility": "permanent", "surface": "secular", "generated": false, "call": "codex.materials.science", "facets": {"subject": ["crystallography", "floor", "materials science", "one map", "solid state"]}, "presentation": {"glyph": "•", "kind_label": "materials science", "by": "Narrow Highway — materials science", "authority": "engine_derived", "posted": "", "standing": ""}, "neighbors": [{"id": "card_mat_lattice", "title": "The lattice — how atoms pack", "relationship": "has part", "why": "a pillar of materials science (The lattice)", "href": "/card/card_mat_lattice", "resolved": true}, {"id": "card_mat_mechanical", "title": "Mechanical behaviour — Hooke and beyond", "relationship": "has part", "why": "a pillar of materials science (Mechanical behaviour)", "href": "/card/card_mat_mechanical", "resolved": true}, {"id": "card_mat_electronic", "title": "Electronic behaviour — bands", "relationship": "has part", "why": "a pillar of materials science (Electronic behaviour)", "href": "/card/card_mat_electronic", "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 science of solids on the one map", "href": "/card/card_k_floor_of_discovery", "resolved": true}], "house": {"door": "FIND", "kind": "card", "trail": "connections", "seal": "/card/card_floor_materials_science", "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_materials_science"}}, "ends": "a verdict or a card · the trail · a seal · one next step"}}