Liquid Metal (Sirius XM) Guy were severed from the channel as part of XM Liquid Metal's signoff. The Hard Attack play list has also been changed, featuring acts that were once heard on the former XM channel Squizz. Mercury has been replaced by Beyond the Pit, which airs in the middle of the night, instead of its former evening drive time slot. As part of the Sirius XM update, Sirius 27 Hard Attack was renamed Liquid Metal (taking the name of the channel that was on XM channel 42). Original subscribers to Sirius and XM have been disappointed because the title change, and others
Liquid air points of liquid nitrogen and liquid oxygen. However, it can be difficult to keep at a stable temperature as the liquid boils, since the nitrogen will boil off first, leaving the mixture oxygen-rich and changing the boiling point. This may also occur in some circumstances due to the liquid air condensing oxygen out of the atmosphere. Liquid air freezes at approximately 58 K (-215 °C)(-355 F), also at standard atmospheric pressure. The constituents of air were once known as "permanent gases", as they could not be liquified solely by compression at room temperature. A compression process will raise the temperature