Glass-to-metal seal absorb the stresses from thermal expansion mismatches. Due to its very low vapor pressure, indium finds use in glass-metal seals used in vacuum technology. Gallium is a soft metal with melting point at 30 °C. It readily wets glasses and most metals and can be used for seals that can be assembled/disassembled by just slight heating. It can be used as a liquid seal up to high temperatures or even at lower temperatures when alloyed with other metals (e.g. as galinstan). Mercury is a metal liquid at normal temperature. It was used as the earliest glass-to-metal seal and is still
Room-temperature superconductor explained as room-temperature superconductivity within a phase formed on the surface of oxygen-doped type IIa diamonds in a vacuum. In 2003, a group of researchers published results on high-temperature superconductivity in palladium hydride (PdH: x>1) and an explanation in 2004. In 2007 the same group published results suggesting a superconducting transition temperature of 260 K. The superconducting critical temperature increases as the density of hydrogen inside the palladium lattice increases. This work has not been corroborated by other groups. In 2012, an "Advanced Materials" article claimed superconducting behavior of graphite powder after treatment with pure water at temperatures as high