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Absolute Indices of Refraction List, Index of Refraction of Various Materials
| Material | Index of Refraction | State | |
|---|---|---|---|
| Vacuum | 1 | (by definition) | |
| Helium | 1.000036 | Gas | (0°C and 1 atm) |
| Hydrogen | 1.000132 | Gas | (0°C and 1 atm) |
| Air | 1.000277 | Gas | (at STP*) |
| Air | 1.000293 | Gas | (0°C and 1 atm) |
| Carbon Dioxide | 1.001 | Gas | (0°C and 1 atm) |
| Liquid Helium | 1.025 | Liquid | (at -270°C) |
| Water Ice | 1.31 | Solid | (at 0°C) |
| Water | 1.330 | Liquid | (at 20°C) |
| Acetone | 1.36 | Liquid | (at 20°C) |
| Ethanol | 1.361 | Liquid | (at 20°C) |
| Kerosene | 1.39 | Liquid | (at 20°C) |
| Corn Oil | 1.47 | Liquid | (at 20°C) |
| Glycerol | 1.4729 | Liquid | (at 20°C) |
| Acrylic Glass | 1.490–1.492 | Solid | (at 20°C) |
| Benzene | 1.501 | Liquid | (at 20°C) |
| Crown Glass (pure) | 1.50–1.54 | Solid | (at 20°C) |
| Plate Glass (window glass) | 1.52 | Solid | (at 20°C) |
| Sodium Chloride (table salt) | 1.544 | Solid | (at 20°C) |
| Amber | 1.55 | Solid | (at 20°C) |
| Polycabonate | 1.60 | Solid | (at 20°C) |
| Flint Glass (pure) | 1.60–1.62 | Solid | (at 20°C) |
| Bromine | 1.661 | Liquid | (at 20°C) |
| Sapphire | 1.762–1.778 | Solid | (at 20°C) |
| Cubic Zirconia | 2.15–2.18 | Solid | (at 20°C) |
| Diamond | 2.417 | Solid | (at 20°C) |
| Silicon | 3.42–3.48 | Solid | (at 20°C) |
| Germanium | 4.05–4.01 | Solid | (at 20°C) |
*STP is defined as a temperature of 273.15 K (0 °C, 32 °F) and an absolute pressure of exactly 105 Pa (100 kPa, 1 bar).
