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| # | Thing | Description | Topic | For | Against | Net | |
|---|---|---|---|---|---|---|---|
| 501 |  | Inch | Unit of length | Physical sciences | 0 | 0 | 0 |
| 502 |  | Indium | Chemical element with atomic number 49 (In) | Physical sciences | 0 | 0 | 0 |
| 503 |  | Inductance | Property of electrical conductors | Physical sciences | 0 | 0 | 0 |
| 504 | Inertia | Fundamental principle of classical physics | Physical sciences | 0 | 0 | 0 | |
| 505 |  | Information science | Academic field concerned with collection and analysis of information | Physical sciences | 0 | 0 | 0 |
| 506 |  | Infrared | Form of electromagnetic radiation | Physical sciences | 0 | 0 | 0 |
| 507 |  | Inorganic chemistry | Field of chemistry | Physical sciences | 0 | 0 | 0 |
| 508 | Inorganic compound | Chemical compound without any carbon-hydrogen bonds | Physical sciences | 0 | 0 | 0 | |
| 509 |  | Intermolecular force | Force of attraction or repulsion between molecules and neighboring particles | Physical sciences | 0 | 0 | 0 |
| 510 |  | Internal structure of Earth | Interior of the earth | Physical sciences | 0 | 0 | 0 |
| 511 |  | International System of Units | Modern form of the metric system | Physical sciences | 0 | 0 | 0 |
| 512 |  | Interplanetary medium | Material which fills the Solar System | Physical sciences | 0 | 0 | 0 |
| 513 |  | Interstellar medium | Matter and radiation in the space between the star systems in a galaxy | Physical sciences | 0 | 0 | 0 |
| 514 |  | Io (moon) | Innermost Galilean moon of Jupiter | Physical sciences | 0 | 0 | 0 |
| 515 |  | Iodine | Chemical element with atomic number 53 (I) | Physical sciences | 0 | 0 | 0 |
| 516 |  | Ion | Particle, atom or molecule with a net electrical charge | Physical sciences | 0 | 0 | 0 |
| 517 |  | Ionic bonding | Chemical bonding involving attraction between ions | Physical sciences | 0 | 0 | 0 |
| 518 |  | Ionization | Process by which atoms or molecules acquire charge by gaining or losing electrons | Physical sciences | 0 | 0 | 0 |
| 519 |  | Ionizing radiation | Harmful high-frequency radiation | Physical sciences | 0 | 0 | 0 |
| 520 |  | Iridium | Chemical element with atomic number 77 (Ir) | Physical sciences | 0 | 0 | 0 |
| 521 |  | Iron | Chemical element with atomic number 26 (Fe) | Physical sciences | 0 | 0 | 0 |
| 522 |  | Irregular galaxy | Class of galaxy | Physical sciences | 0 | 0 | 0 |
| 523 |  | Island | Piece of subcontinental land surrounded by water | Physical sciences | 0 | 0 | 0 |
| 524 |  | Isotope | Atoms of the same element, but different mass | Physical sciences | 0 | 0 | 0 |
| 525 |  | Ivory | Material derived from the tusks and teeth of animals | Physical sciences | 0 | 0 | 0 |
| 526 |  | Jade | Ornamental stone, commonly green | Physical sciences | 0 | 0 | 0 |
| 527 |  | Jet stream | Fast-flowing atmospheric air current | Physical sciences | 0 | 0 | 0 |
| 528 |  | Joule | SI unit of energy | Physical sciences | 0 | 0 | 0 |
| 529 |  | Jungle | Impassably dense forest, typically tropical | Physical sciences | 0 | 0 | 0 |
| 530 |  | Jupiter | Fifth planet from the Sun | Physical sciences | 0 | 0 | 0 |
| 531 |  | Jurassic | Second period of the Mesozoic Era | Physical sciences | 0 | 0 | 0 |
| 532 |  | Kaolinite | Phyllosilicate clay mineral | Physical sciences | 0 | 0 | 0 |
| 533 |  | Karst | Topography from dissolved soluble rocks | Physical sciences | 0 | 0 | 0 |
| 534 |  | Kelvin | SI unit of temperature | Physical sciences | 0 | 0 | 0 |
| 535 |  | Kepler's laws of planetary motion | Laws describing planetary orbits | Physical sciences | 0 | 0 | 0 |
| 536 |  | Ketone | Organic compounds of the form >C=O | Physical sciences | 0 | 0 | 0 |
| 537 |  | Kilogram | Metric unit of mass | Physical sciences | 0 | 0 | 0 |
| 538 | Kinematics | Branch of physics describing the motion of objects without considering forces | Physical sciences | 0 | 0 | 0 | |
| 539 |  | Kinetic energy | Energy of a moving physical body | Physical sciences | 0 | 0 | 0 |
| 540 | Kirchhoff's circuit laws | Two equalities that deal with the current and potential difference | Physical sciences | 0 | 0 | 0 | |
| 541 |  | Knot (unit) | Unit of speed | Physical sciences | 0 | 0 | 0 |
| 542 |  | Krypton | Chemical element with atomic number 36 (Kr) | Physical sciences | 0 | 0 | 0 |
| 543 |  | Kuiper belt | Area of the Solar System beyond the planets, comprising small bodies | Physical sciences | 0 | 0 | 0 |
| 544 |  | Köppen climate classification | Climate classification system | Physical sciences | 0 | 0 | 0 |
| 545 |  | Laboratory | Workplace for scientific activity | Physical sciences | 0 | 0 | 0 |
| 546 |  | Lactic acid | Organic acid | Physical sciences | 0 | 0 | 0 |
| 547 |  | Lagoon | Shallow body of water separated from a larger one by a narrow landform | Physical sciences | 0 | 0 | 0 |
| 548 |  | Lagrange point | Equilibrium points near two orbiting bodies | Physical sciences | 0 | 0 | 0 |
| 549 |  | Lagrangian mechanics | Formulation of classical mechanics | Physical sciences | 0 | 0 | 0 |
| 550 |  | Lake | Large inland body of relatively still water | Physical sciences | 0 | 0 | 0 |
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