Chemistry at very high pressures, arbitrarily chosen to be above 10,000 bars (10⁹ pascals), and mainly concerned with solid and liquid states. A bar is 10⁶ dynes/cm², or 1.0197 kg/cm², or 0.9869 atm, or 10⁵ Pa. Multiples of the bar are the kilobar (1 kilobar = 10³ bars = 10⁸ Pa) and the megabar (1 mega-bar = 10⁶ bars = 10¹¹ Pa). At 25°C (77°F) and 10 kilobars (10⁹ Pa), nearly all ordinary gases are liquid or solid, and only a few liquids are not frozen; thus most high-pressure chemistry involves either higher temperatures, at which chemical reactions can occur at appreciable rates, or studies of internal arrangements in solids.