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| Molecular Weight | 54.0904 |
| Formula | C4H6 |
| Melting Point | -108.9 °C, 164.3 K, -164.0 °F |
| Boiling Point | -4.4 °C, 269 °K, 24 °F |
| Density | 0.64 g/cm3 at -6 °C, liquid |
| Solubility in Water | 735 ppm |