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| # | Thing | Description | Topic | Up/Down/Net | Score ▼ | |
|---|---|---|---|---|---|---|
| 801 |  | Procyon | Star in the constellation Canis Minor | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 802 |  | Promethium | Chemical element with atomic number 61 (Pm) | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 803 |  | Propane | Hydrocarbon compound (C3H8) | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 804 |  | Properties of water | Physical and chemical properties of pure water | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 805 |  | Proton | Subatomic particle with positive charge | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 806 |  | Protostar | Early stage in the process of star formation | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 807 |  | Pulsar | Type of neutron star with beams of radiation | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 808 |  | Purple | Range of colors with the hues between blue and red | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 809 |  | Pyroxene | Group of inosilicate minerals with single chains of silica tetrahedra | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 810 | Quantitative research | All procedures for the numerical representation of empirical facts | Physical sciences | +0 / -0 / 0 | 0.500000 | |
| 811 |  | Quantum chemistry | Chemistry based on quantum physics | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 812 |  | Quantum chromodynamics | Theory of the strong nuclear interactions | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 813 |  | Quantum electrodynamics | Quantum field theory of electromagnetism | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 814 |  | Quantum entanglement | Physics phenomenon | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 815 | | Quantum field theory | Theoretical framework in physics | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 816 |  | Quantum mechanics | Description of physical properties at the atomic and subatomic scale | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 817 | Quantum tunnelling | Quantum mechanical phenomenon | Physical sciences | +0 / -0 / 0 | 0.500000 | |
| 818 | | Quark | Elementary particle, fundamental constituent of matter | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 819 |  | Quasar | Active galactic nucleus (AGN) containing a supermassive black hole | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 820 |  | Quaternary | Third and current period of the Cenozoic Era, from 2.58 million years ago to the present | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 821 |  | Radian | SI derived unit of angle | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 822 |  | Radiation | Waves or particles moving through space | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 823 |  | Radical (chemistry) | Atom, molecule, or ion that has an unpaired valence electron; typically highly reactive | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 824 |  | Radio galaxy | Type of active galaxy that is very luminous at radio wavelengths | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 825 |  | Radio wave | Type of electromagnetic radiation | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 826 |  | Radioactive decay | Emissions from unstable atomic nuclei | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 827 |  | Radium | Chemical element with atomic number 88 (Ra) | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 828 |  | Rain | Form of precipitation | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 829 |  | Rainbow | Meteorological phenomenon | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 830 |  | Rainforest | Type of forest with high rainfall | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 831 |  | Rapids | River section with increased velocity and turbulence | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 832 |  | Reaction mechanism | Any model explaining a chemical reaction | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 833 |  | Red giant | Type of large cool star | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 834 |  | Redox | Chemical reaction with oxidation state changes | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 835 |  | Redshift | Change in wavelength of light | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 836 |  | Reflection (physics) | "Bouncing back" of waves at an interface | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 837 |  | Refraction | Physical phenomenon relating to the direction of waves | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 838 | | Refractive index | Property in optics | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 839 | Relativistic mechanics | Theory of motion and forces for objects close to the speed of light | Physical sciences | +0 / -0 / 0 | 0.500000 | |
| 840 |  | Research | Systematic study undertaken to increase knowledge | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 841 |  | Resonance | Physical characteristic of oscillating systems | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 842 |  | Reynolds number | Ratio of inertial to viscous forces acting on a liquid | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 843 |  | Rhenium | Chemical element with atomic number 75 (Re) | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 844 |  | Rhodium | Chemical element with atomic number 45 (Rh) | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 845 |  | Rigel | Brightest star in the constellation Orion | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 846 |  | Ring Nebula | Planetary nebula in Lyra | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 847 |  | Ring system | Ring of cosmic dust orbiting an astronomical object | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 848 |  | River delta | Silt deposition landform at the mouth of a river | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 849 |  | Rotation | Movement of an object which leaves at least one point unchanged | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 850 |  | Rubidium | Chemical element with atomic number 37 (Rb) | Physical sciences | +0 / -0 / 0 | 0.500000 |
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