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| # | Thing | Description | Topic | Up/Down/Net | Score ▼ | |
|---|---|---|---|---|---|---|
| 51 |  | Energy | Physical quantity | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 52 |  | Wave interference | Phenomenon resulting from the superposition of two waves | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 53 |  | Brass | Alloy of copper and zinc | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 54 |  | Dune | Hill of loose sand built by aeolian processes or the flow of water | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 55 |  | Red | Primary color | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 56 |  | Triton (moon) | Largest moon of Neptune | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 57 |  | Solution (chemistry) | Homogeneous mixture of a solute and a solvent | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 58 |  | Chemical element | Chemical substance not composed of simpler ones | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 59 |  | Uranus | Seventh planet from the Sun | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 60 |  | Mirage | Optical illusion caused by bending of light | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 61 |  | Vacuum | Space that is empty of matter | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 62 |  | Gluon | Elementary particle that mediates the strong force | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 63 |  | Lux | SI derived unit of illuminance | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 64 |  | Alkane | Type of saturated hydrocarbon compound | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 65 |  | Jupiter | Fifth planet from the Sun | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 66 |  | Potential energy | Energy held by an object because of its position relative to other objects | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 67 |  | Atomic mass | Rest mass of an atom in its ground state | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 68 |  | Atomic nucleus | Core of an atom composed of nucleons | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 69 |  | Combustion | Chemical reaction between a fuel and oxygen | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 70 |  | Glacial landform | Landform created by the action of glaciers | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 71 | Muon | Subatomic particle | Physical sciences | +1 / -0 / +1 | 0.523810 | |
| 72 |  | Mid-ocean ridge | Basaltic underwater mountain system formed by plate tectonic spreading | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 73 |  | Planck units | Units defined only by physical constants | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 74 | Kirchhoff's circuit laws | Two equalities that deal with the current and potential difference | Physical sciences | +1 / -0 / +1 | 0.523810 | |
| 75 |  | Ferromagnetism | Mechanism by which materials form into and are attracted to magnets | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 76 |  | Land | Earth's dry surface | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 77 |  | Astronomical unit | Mean distance between Earth and the Sun | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 78 |  | International System of Units | Modern form of the metric system | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 79 |  | Avalanche | Rapid flow of a mass of snow down a slope | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 80 |  | Week | Time unit equal to seven days | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 81 |  | Visible spectrum | Portion of the electromagnetic spectrum that is visible to the human eye | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 82 |  | Ohm's law | Law of electrical current and voltage | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 83 | Decibel | Logarithmic unit expressing the ratio of physical quantities | Physical sciences | +1 / -0 / +1 | 0.523810 | |
| 84 |  | Mercury (planet) | First planet from the Sun | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 85 |  | Celsius | Unit of measurement for temperature | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 86 |  | Flight | Movement of an object through air | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 87 |  | Particle | Small localized object | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 88 |  | Acre | Unit of area | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 89 |  | Copper | Chemical element with atomic number 29 (Cu) | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 90 |  | Cosmological constant | Value representing energy density of space | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 91 |  | Entropy | Property of a thermodynamic system | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 92 |  | Star cluster | Group of stars | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 93 |  | Stellar evolution | Changes to stars over their lifespans | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 94 |  | Aurora | Atmospheric effect caused by the solar wind | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 95 |  | Ice age | Period of long-term reduction in temperature of Earth's surface and atmosphere | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 96 |  | Ethane | Organic compound (H3C–CH3) | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 97 |  | Lithosphere | Outermost shell of a terrestrial-type planet or natural satellite | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 98 | Spin (physics) | Intrinsic quantum property of particles | Physical sciences | +1 / -0 / +1 | 0.523810 | |
| 99 |  | Heat transfer | Thermal engineering discipline concerning transfer of heat in physical systems | Physical sciences | +1 / -0 / +1 | 0.523810 |
| 100 | Harmonic oscillator | Physical system that responds to a restoring force proportional to displacement | Physical sciences | +1 / -0 / +1 | 0.523810 |
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