By the top of the troposphere, about 12 km above sea level, most water vapor condenses to liquid water or ice as it releases its heat of vapourisation.
12.
Of course a vacuum will lower these temperatures but if you do not supply energy to a system it cannot gain the energy suuficient for vapourisation . talk ) 14 : 50, 15 November 2008 ( UTC)
13.
Unlike gases, a typical liquid propellant has a density similar to water, approximately 0.7 1.4g / cm?( except liquid hydrogen which has a much lower density ), while requiring only relatively modest pressure to prevent vapourisation.
14.
The simplest design has a pressurised water tank where the water is heated before launch, however, this gives a very low exhaust velocity since the high latent heat of vapourisation means that very little actual steam is produced and the exhaust consists mostly of water, or if high temperatures and pressures are used, then the tank is very heavy.
15.
Further evidence that vapourisation did not occur is that when Rubio Bonelli visited the rift the following day, the newly opened fissure " . . . " Was not issuing fumes, vapour, steam, ashes, lava or other materials " . . . " In fact at no time during or after was steam or phreatomagmatic activity reported.
16.
As a result, large volumes of PCBs have been introduced into the environment through open burning or incomplete incineration; by vapourisation from paints, coatings and plastics; by direct entry or leakage into sewers and streams; by dumping in non-secure landfill sites and municipal disposal facilities; and by other disposal techniques like ocean dumping which did not destroy material.
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