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| # | Thing | Description | Topic | For | Against | Net | |
|---|---|---|---|---|---|---|---|
| 851 |  | Redox | Chemical reaction with oxidation state changes | Physical sciences | 0 | 0 | 0 |
| 852 |  | Redshift | Change in wavelength of light | Physical sciences | 0 | 0 | 0 |
| 853 |  | Reflection (physics) | "Bouncing back" of waves at an interface | Physical sciences | 0 | 0 | 0 |
| 854 |  | Refraction | Physical phenomenon relating to the direction of waves | Physical sciences | 0 | 0 | 0 |
| 855 | | Refractive index | Property in optics | Physical sciences | 0 | 0 | 0 |
| 856 | Relativistic mechanics | Theory of motion and forces for objects close to the speed of light | Physical sciences | 0 | 0 | 0 | |
| 857 |  | Research | Systematic study undertaken to increase knowledge | Physical sciences | 0 | 0 | 0 |
| 858 |  | Resonance | Physical characteristic of oscillating systems | Physical sciences | 0 | 0 | 0 |
| 859 |  | Reynolds number | Ratio of inertial to viscous forces acting on a liquid | Physical sciences | 0 | 0 | 0 |
| 860 |  | Rhenium | Chemical element with atomic number 75 (Re) | Physical sciences | 0 | 0 | 0 |
| 861 |  | Rhodium | Chemical element with atomic number 45 (Rh) | Physical sciences | 0 | 0 | 0 |
| 862 |  | Rigel | Brightest star in the constellation Orion | Physical sciences | 0 | 0 | 0 |
| 863 |  | Ring Nebula | Planetary nebula in Lyra | Physical sciences | 0 | 0 | 0 |
| 864 |  | Ring system | Ring of cosmic dust orbiting an astronomical object | Physical sciences | 0 | 0 | 0 |
| 865 |  | River | Natural flowing freshwater stream | Physical sciences | 0 | 0 | 0 |
| 866 |  | River delta | Silt deposition landform at the mouth of a river | Physical sciences | 0 | 0 | 0 |
| 867 |  | Rock (geology) | Naturally occurring mineral aggregate | Physical sciences | 0 | 0 | 0 |
| 868 |  | Rotation | Movement of an object which leaves at least one point unchanged | Physical sciences | 0 | 0 | 0 |
| 869 |  | Rubidium | Chemical element with atomic number 37 (Rb) | Physical sciences | 0 | 0 | 0 |
| 870 |  | Ruby | Variety of corundum, mineral, gemstone | Physical sciences | 0 | 0 | 0 |
| 871 |  | Ruthenium | Chemical element with atomic number 44 (Ru) | Physical sciences | 0 | 0 | 0 |
| 872 | Rutherford scattering experiments | Experiments proving existence of atomic nuclei | Physical sciences | 0 | 0 | 0 | |
| 873 |  | Sagittarius A* | Supermassive black hole at the center of the Milky Way | Physical sciences | 0 | 0 | 0 |
| 874 |  | Salt (chemistry) | Chemical compound involving ionic bonding | Physical sciences | 0 | 0 | 0 |
| 875 |  | Samarium | Chemical element with atomic number 62 (Sm) | Physical sciences | 0 | 0 | 0 |
| 876 |  | Sand | Granular material composed of finely divided rock and mineral particles | Physical sciences | 0 | 0 | 0 |
| 877 |  | Sandstone | Type of sedimentary rock | Physical sciences | 0 | 0 | 0 |
| 878 |  | Sapphire | Gem variety of the mineral corundum | Physical sciences | 0 | 0 | 0 |
| 879 |  | Saturn | Sixth planet from the Sun | Physical sciences | 0 | 0 | 0 |
| 880 |  | Savanna | Mixed woodland-grassland ecosystem | Physical sciences | 0 | 0 | 0 |
| 881 |  | Scandium | Chemical element with atomic number 21 (Sc) | Physical sciences | 0 | 0 | 0 |
| 882 |  | Scattering | Range of physical processes in physics | Physical sciences | 0 | 0 | 0 |
| 883 |  | Schist | Easily split medium-grained metamorphic rock | Physical sciences | 0 | 0 | 0 |
| 884 | Schrödinger equation | Description of a quantum-mechanical system | Physical sciences | 0 | 0 | 0 | |
| 885 | Science | Systematic endeavour to gain knowledge | Physical sciences | 0 | 0 | 0 | |
| 886 | Scientific law | Statement based on repeated empirical observations that describes some natural phenomenon | Physical sciences | 0 | 0 | 0 | |
| 887 | Scientific method | Interplay between observation, experiment, and theory in science | Physical sciences | 0 | 0 | 0 | |
| 888 |  | Scientific modelling | Scientific activity that produces models | Physical sciences | 0 | 0 | 0 |
| 889 | Scientific theory | Falsifiable explanation of natural phenomena | Physical sciences | 0 | 0 | 0 | |
| 890 |  | Sea | Large body of salt water | Physical sciences | 0 | 0 | 0 |
| 891 |  | Sea ice | Outcome of seawater as it freezes | Physical sciences | 0 | 0 | 0 |
| 892 |  | Sea level | Geographical reference point from which various heights are measured | Physical sciences | 0 | 0 | 0 |
| 893 |  | Seabed | Bottom of the ocean | Physical sciences | 0 | 0 | 0 |
| 894 |  | Seamount | Mountain rising from the ocean seafloor that does not reach the water's surface | Physical sciences | 0 | 0 | 0 |
| 895 |  | Season | Division of the year | Physical sciences | 0 | 0 | 0 |
| 896 |  | Second | SI unit of time | Physical sciences | 0 | 0 | 0 |
| 897 |  | Sediment | Particulate solid matter deposited on a planetary surface | Physical sciences | 0 | 0 | 0 |
| 898 |  | Sedimentary basin | Regions of long-term subsidence creating space for infilling by sediments | Physical sciences | 0 | 0 | 0 |
| 899 |  | Sedimentary rock | Rock formed by the deposition and cementation of particles | Physical sciences | 0 | 0 | 0 |
| 900 |  | Seismology | Scientific study of earthquakes and propagation of elastic waves through a planet | Physical sciences | 0 | 0 | 0 |
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