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| # | Thing | Description | Topic | For | Against | Net | |
|---|---|---|---|---|---|---|---|
| 451 |  | Halogen | Group of chemical elements | Physical sciences | 0 | 0 | 0 |
| 452 |  | Hamiltonian mechanics | Formulation of classical mechanics using momenta | Physical sciences | 0 | 0 | 0 |
| 453 | Harmonic oscillator | Physical system that responds to a restoring force proportional to displacement | Physical sciences | 0 | 0 | 0 | |
| 454 |  | Heat | Type of energy transfer | Physical sciences | 0 | 0 | 0 |
| 455 |  | Heat capacity | Physical property of matter | Physical sciences | 0 | 0 | 0 |
| 456 |  | Heat transfer | Thermal engineering discipline concerning transfer of heat in physical systems | Physical sciences | 0 | 0 | 0 |
| 457 |  | Hectare | Metric unit of area | Physical sciences | 0 | 0 | 0 |
| 458 |  | Helium | Chemical element with atomic number 2 (He) | Physical sciences | 0 | 0 | 0 |
| 459 |  | Hertz | SI unit of frequency | Physical sciences | 0 | 0 | 0 |
| 460 |  | Hertzsprung–Russell diagram | Scatter plot of stars showing the relationship of luminosity to stellar classification | Physical sciences | 0 | 0 | 0 |
| 461 |  | Higgs boson | Elementary particle involved with rest mass | Physical sciences | 0 | 0 | 0 |
| 462 |  | High-pressure area | Region with higher atmospheric pressure | Physical sciences | 0 | 0 | 0 |
| 463 |  | Hill | Landform that extends above the surrounding terrain | Physical sciences | 0 | 0 | 0 |
| 464 |  | History of Earth | Records of Earth's development | Physical sciences | 0 | 0 | 0 |
| 465 |  | History of atomic theory | Physical sciences | 0 | 0 | 0 | |
| 466 |  | Holmium | Chemical element with atomic number 67 (Ho) | Physical sciences | 0 | 0 | 0 |
| 467 |  | Holocene | Current geological epoch | Physical sciences | 0 | 0 | 0 |
| 468 |  | Hooke's law | Force needed to pull a spring grows linearly with distance | Physical sciences | 0 | 0 | 0 |
| 469 |  | Horizon | Apparent curve that separates earth from sky | Physical sciences | 0 | 0 | 0 |
| 470 |  | Horsehead Nebula | Dark nebula in the constellation Orion | Physical sciences | 0 | 0 | 0 |
| 471 |  | Hot spring | Spring produced by the emergence of geothermally heated groundwater | Physical sciences | 0 | 0 | 0 |
| 472 |  | Hotspot (geology) | Volcanic region hotter than the surrounding mantle | Physical sciences | 0 | 0 | 0 |
| 473 |  | Hour | Unit of time equal to 60 minutes | Physical sciences | 0 | 0 | 0 |
| 474 |  | Hubble's law | Observation in physical cosmology | Physical sciences | 0 | 0 | 0 |
| 475 |  | Humidity | Concentration of water vapour in the air | Physical sciences | 0 | 0 | 0 |
| 476 |  | Hyades (star cluster) | Open cluster in the constellation Taurus | Physical sciences | 0 | 0 | 0 |
| 477 |  | Hydrocarbon | Organic compound consisting entirely of hydrogen and carbon | Physical sciences | 0 | 0 | 0 |
| 478 |  | Hydrochloric acid | Aqueous solution of hydrogen chloride | Physical sciences | 0 | 0 | 0 |
| 479 |  | Hydrofluoric acid | Solution of hydrogen fluoride in water | Physical sciences | 0 | 0 | 0 |
| 480 |  | Hydrogen | Chemical element with atomic number 1 (H) | Physical sciences | 0 | 0 | 0 |
| 481 |  | Hydrogen bond | Intermolecular attraction between a hydrogen donor-and-acceptor pair | Physical sciences | 0 | 0 | 0 |
| 482 |  | Hydrogen peroxide | Chemical compound | Physical sciences | 0 | 0 | 0 |
| 483 |  | Hydrography | Measurement of bodies of water | Physical sciences | 0 | 0 | 0 |
| 484 |  | Hydrology | Science of the movement, distribution, and quality of water on Earth | Physical sciences | 0 | 0 | 0 |
| 485 |  | Hydrosphere | Liquid water on a planet | Physical sciences | 0 | 0 | 0 |
| 486 |  | Ice | Frozen water; the solid state of water | Physical sciences | 0 | 0 | 0 |
| 487 |  | Ice age | Period of long-term reduction in temperature of Earth's surface and atmosphere | Physical sciences | 0 | 0 | 0 |
| 488 |  | Ice sheet | Large mass of glacial ice | Physical sciences | 0 | 0 | 0 |
| 489 |  | Ice shelf | Large platform of glacial ice | Physical sciences | 0 | 0 | 0 |
| 490 |  | Iceberg | Large formation of floating ice | Physical sciences | 0 | 0 | 0 |
| 491 |  | Ideal gas law | Equation of the state of a hypothetical ideal gas | Physical sciences | 0 | 0 | 0 |
| 492 |  | Igneous rock | Rock formed through the cooling and solidification of magma or lava | Physical sciences | 0 | 0 | 0 |
| 493 |  | Impact crater | Circular depression in a solid astronomical body formed by the impact of a smaller object | Physical sciences | 0 | 0 | 0 |
| 494 |  | Impact event | Collision of two astronomical objects | Physical sciences | 0 | 0 | 0 |
| 495 |  | Imperial units | System of measurements | Physical sciences | 0 | 0 | 0 |
| 496 |  | Impulse (physics) | Integral of a comparatively larger force over a short time interval | Physical sciences | 0 | 0 | 0 |
| 497 |  | Inch | Unit of length | Physical sciences | 0 | 0 | 0 |
| 498 |  | Indium | Chemical element with atomic number 49 (In) | Physical sciences | 0 | 0 | 0 |
| 499 |  | Inductance | Property of electrical conductors | Physical sciences | 0 | 0 | 0 |
| 500 | Inertia | Fundamental principle of classical physics | Physical sciences | 0 | 0 | 0 |
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