<Tr> <Td> Liquid helium </Td> <Td> </Td> <Td> 1.025 </Td> <Td> </Td> </Tr> <Tr> <Td> Perfluorohexane (Fluorinert FC - 72) </Td> <Td> </Td> <Td> 1.251 </Td> <Td> </Td> </Tr> <Tr> <Td> Water ice </Td> <Td> </Td> <Td> 1.31 </Td> <Td> </Td> </Tr> <Tr> <Td> TFE / PDD (Teflon AF) </Td> <Td> </Td> <Td> 1.315 </Td> <Td> </Td> </Tr>

A yellow solid at room temperature and 1 atm