When an airtight vacuum system is exposed to air and then pumped, if it is not baked, the partial pressure analyzer will show the peak at the mass of 18 (H2O). This will continue for weeks and months.
The table of water vapor pressure as a function of temperature indicates that the vapor pressure doubles when the temperature is increased by 12 ℃ near the room temperature. Although there is no liquid water in the system after prolonged pumping, there may be a very similar pressure temperature relationship between the surface layer of adsorbed water and the vapor pressure in equilibrium above the adsorbed layer
Honig plotted the vapor pressure of the elements over a wide temperature range in logarithmic coordinates. In the discussion, it is particularly significant that the slope of the curve. At room temperature, it is typical that the temperature increases by 20 ℃ and the pressure changes by 10 times.
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