Q12.4 Outdoor air of 5 ° C, e = 0.8 and p = 77.3 cm Hg is heated isobarically to 20 ° C.  What is the humidity level then?  How much water must evaporate per m³ of cold air to bring e back to 0.8?

Maximum pressure, density for water and saturated water vapor

T	pmax	ρL	ρverz
(°C)	(bar)	(kg/m3)	(kg/m3)
0	0,00609	999,8	0,00485
5	0,00866	1000	0,00680
10	0,01226	999,6	0,00940
15	0,0169	999	0,0128
20	0,0233	998	0,0173
25	0,0317	997	0,0230
30	0,0424	996	0,0304
35	0,0561	994	0,0396
40	0,0737	992	0,0511
45	0,0957	990	0,0654
50	0,1232	988	0,0830
55	0,157	986	0,104
60	0,200	983	0,130
65	0,250	980	0,161
70	0,312	978	0,198
75	0,385	975	0,242
80	0,473	972	0,293
85	0,577	969	0,353
90	0,700	965	0,424
95	0,844	962	0,505
100	1,013	958	0,595
105	1,207	955	0,705
110	1,432	951	0,827
115	1,688	947	0,965
120	1,984	943	1,122
125	2,319	939	1,30

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From ideal gas equation we can write nRTPV P773 cm Hg1017atm Humiditydensity of dry airdensity ... View the full answer