Bromine is barely liquid at room temperature, boiling at about 330 kelvins. The oldest white dwarfs still radiate at temperatures of a few thousand kelvins. Plasma temperatures must reach many millions of kelvins. "T" is the thermodynamic temperature (SI unit kelvins). These in turn serve to heat the corona to temperatures over a million kelvins. The last two digits indicate the color temperature of the lamp in kelvins (K). The central star itself is a white dwarf with a temperature of 120,000 kelvins. Cryogenic fluids with their boiling point in kelvins. Around this time, laser cooling techniques had allowed for temperatures lowered to around 40 kelvins. Vapour pressure is given by , where "T" is temperature in kelvins. The gas is pressurized and then heated to as high as 1400 kelvins.