Hydrogen At Room Temperature And Pressure

Hydrogen is a gas at room temperature and standard pressure.

Hydrogen at room temperature and pressure.

Hydrogen becomes a solid at 25 c when subjected to a pressure of 57 kilobars. The hydrogen phase diagram shows the phase behavior with changes in temperature and pressure. Hydrogen density at different temperatures and pressures hydrogen density at different temperatures and pressures. The pacific northwest national laboratory with funding from the doe office of energy efficiency and renewable energy s hydrogen and fuel cell technologies office.

The refractive index of the high pressure phase. At this pressure 5 kg of hydrogen can be stored in a 75 liter tank. Metallic fluid hydrogen at 3000 k is a quantum fluid both electronically and vibrationally because the temperature is small compared to the fermi temperature and the ground state vibrational energy of the molecule is 3000 k comparable to the temperature with the first excited state at 9000 k. Hydrogen is also in thermal equilibrium in the 100 ns lifetime of the experiment because the time between molecular collisions is 10 ns.

The curve between the critical point and the triple point shows the hydrogen boiling point with changes in pressure. However at very low temperature and or high pressures the gas becomes a liquid or a solid. The high pressure phase appears as a transparent crystalline mass. Hydrogen can be physically stored as either a gas or a liquid.

If it were a solid at room temperature then that would be the state of matter. Storage as a gas typically requires high pressure tanks 5000 10 000 psi tank pressure. Hydrogen turns into a liquid when it is cooled to a temperature below 252 87 c. In order to maintain liquid hydrogen at this temperature tanks must be perfectly isolated.

At 252 87 c and 1 013 bar liquid hydrogen has a density of close to 71 kg m 3.