{"query": "Density from mass and volume", "count": 20, "results": [{"id": "card_works_density", "title": "Density from mass and volume", "shelf": "the-works", "surface": "secular", "snippet": "Ten kilograms in five litres is a density of 2,000 kg/m³ — ρ = m/V, the property that tells iron from aluminium and floats a ship of steel.  Worked & sealed by the engine — ρ = 10 / 0.005 = 2000 kg/m³", "authority_tier": "verified", "source": "The Works — worked & sealed", "generated": false}, {"id": "card_theory_quantum_information___entanglement__von_neumann_entr", "title": "Quantum information & entanglement (von Neumann entropy)", "shelf": "theories", "surface": "secular", "snippet": "Quantum information & entanglement (von Neumann entropy) — an engine domain that can touch it: information_theory. Calibration: seals. S = -Tr(ρ log ρ), the entropy of a density matrix, which reduces ", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_theory_periodic_law", "title": "Periodic law (Mendeleev)", "shelf": "theories", "surface": "secular", "snippet": "Periodic law (Mendeleev) — an engine domain that can touch it: periodic_table. Calibration: seals — element properties and group trends look up and compute. Arrange elements by atomic number and their", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_theory_physical_oceanography", "title": "Physical oceanography (hydrostatics, tides)", "shelf": "theories", "surface": "secular", "snippet": "Physical oceanography (hydrostatics, tides) — an engine domain that can touch it: oceanography. Calibration: seals — pressure with depth and tidal periods compute. Pressure rises about one atmosphere ", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_theory_category_theory", "title": "Category theory (the mathematics of structure-preserving maps)", "shelf": "theories", "surface": "secular", "snippet": "Category theory (the mathematics of structure-preserving maps) — an engine domain that can touch it: mathematics. Calibration: map-only — an organising framework rather than a computation. Study objec", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_src_word_optical_density", "title": "optical density", "shelf": "dictionary", "surface": "secular", "snippet": "optical density: (noun) (physics) a measure of the extent to which a substance transmits light or other electromagnetic radiation — syn: transmission density, photographic density, absorbance", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_photographic_density", "title": "photographic density", "shelf": "dictionary", "surface": "secular", "snippet": "photographic density: (noun) (physics) a measure of the extent to which a substance transmits light or other electromagnetic radiation — syn: optical density, transmission density, absorbance", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_transmission_density", "title": "transmission density", "shelf": "dictionary", "surface": "secular", "snippet": "transmission density: (noun) (physics) a measure of the extent to which a substance transmits light or other electromagnetic radiation — syn: optical density, photographic density, absorbance", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_law_of_volumes", "title": "law of volumes", "shelf": "dictionary", "surface": "secular", "snippet": "law of volumes: (noun) (physics) the density of an ideal gas at constant pressure varies inversely with the temperature — syn: Gay-Lussac's law, Charles's law", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_fed_nasa_techdoc_19750014230", "title": "Analysis of operational requirements for medium density air transportation. Volume 3: Appendix", "shelf": "science", "surface": "secular", "snippet": "Analysis of operational requirements for medium density air transportation. Volume 3: Appendix. A United States federal publication, public domain (17 USC 105). The full text (296,075 bytes) is held o", "authority_tier": "reference", "source": "NASA technical documents (PD, 17 USC 105)", "generated": false}, {"id": "card_src_word_vapor_density", "title": "vapor density", "shelf": "dictionary", "surface": "secular", "snippet": "vapor density: (noun) the density of a gas relative to the density of hydrogen — syn: vapour density", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_vapour_density", "title": "vapour density", "shelf": "dictionary", "surface": "secular", "snippet": "vapour density: (noun) the density of a gas relative to the density of hydrogen — syn: vapor density", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_density", "title": "density", "shelf": "dictionary", "surface": "secular", "snippet": "density: (noun) the amount per unit size — syn: denseness · (noun) the spatial property of being crowded together — syn: concentration, denseness, tightness, compactness", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_magnetic_flux_density", "title": "magnetic flux density", "shelf": "dictionary", "surface": "secular", "snippet": "magnetic flux density: (noun) the amount of magnetic flux in a unit area perpendicular to the direction of magnetic flow — syn: magnetic field strength, magnetic intensity, magnetic induction", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_very_low_density_lipoprotein", "title": "very low density lipoprotein", "shelf": "dictionary", "surface": "secular", "snippet": "very low density lipoprotein: (noun) large lipoproteins rich in triglycerides; VLDLs circulate through the blood giving up their triglycerides to fat and muscle tissue until the VLDL remnants are modi", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_high_density_lipoprotein", "title": "high-density lipoprotein", "shelf": "dictionary", "surface": "secular", "snippet": "high-density lipoprotein: (noun) a lipoprotein that transports cholesterol in the blood; composed of a high proportion of protein and relatively little cholesterol; high levels are thought to be assoc", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_low_density_lipoprotein", "title": "low-density lipoprotein", "shelf": "dictionary", "surface": "secular", "snippet": "low-density lipoprotein: (noun) a lipoprotein that transports cholesterol in the blood; composed of moderate amount of protein and a large amount of cholesterol; high levels are thought to be associat", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_fed_nasa_techdoc_19860005028", "title": "High-density digital recording", "shelf": "science", "surface": "secular", "snippet": "High-density digital recording. A United States federal publication, public domain (17 USC 105). The full text (2,644,305 bytes) is held on the ark; waybill sha256 f757a95d3d63e47a…; origin archive.or", "authority_tier": "reference", "source": "NASA technical documents (PD, 17 USC 105)", "generated": false}, {"id": "card_src_word_relative_density", "title": "relative density", "shelf": "dictionary", "surface": "secular", "snippet": "relative density: (noun) the ratio of the density of something to the density of a standard", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_fed_cat10661260", "title": "Density, modulus of elasticity, creep, and durability of hardboard : a bibliography", "shelf": "ecology", "surface": "secular", "snippet": "Density, modulus of elasticity, creep, and durability of hardboard : a bibliography. A United States federal publication, public domain (17 USC 105). The full text (220,080 bytes) is held on the ark; ", "authority_tier": "reference", "source": "US Forest Service publications (PD, 17 USC 105)", "generated": false}]}