化工企业当中，有时候需要考虑环境当中的水分含量，涉及到水的饱和蒸汽以及相对湿度。下表为水的饱和蒸汽压表：

温度/℃	饱和蒸气压/kPa	温度/℃	饱和蒸气压/kPa	温度/℃	饱和蒸气压/kPa
0	0.61129	125	232.01	250	3973.6
1	0.65716	126	239.24	251	4041.2
2	0.70605	127	246.66	252	4109.6
3	0.75813	128	254.25	253	4178.9
4	0.81359	129	262.04	254	4249.1
5	0.87260	130	270.02	255	4320.2
6	0.93537	131	278.20	256	4392.2
7	1.0021	132	286.57	257	4465.1
8	1.0730	133	295.15	258	4539.0
9	1.1482	134	303.93	259	4613.7
10	1.2281	135	312.93	260	4689.4
11	1.3129	136	322.14	261	4766.1
12	1.4027	137	331.57	262	4843.7
13	1.4979	138	341.22	263	4922.3
14	1.5988	139	351.09	264	5001.8
15	1.7056	140	361.19	265	5082.3
16	1.8185	141	371.53	266	5163.8
17	1.9380	142	382.11	267	5246.3
18	2.0644	143	392.92	268	5329.8
19	2.1978	144	403.98	269	5414.3
20	2.3388	145	415.29	270	5499.9
21	2.4877	146	426.85	271	5586.4
22	2.6447	147	438.67	272	5674.0
23	2.8104	148	450.75	273	5762.7
24	2.9850	149	463.10	274	5852.4
25	3.1690	150	475.72	275	5943.1
26	3.3629	151	488.61	276	6035.0
27	3.5670	152	501.78	277	6127.9
28	3.7818	153	515.23	278	6221.9
29	4.0078	154	528.96	279	6317.2
30	4.2455	155	542.99	280	6413.2
31	4.4953	156	557.32	281	6510.5
32	4.7578	157	571.94	282	6608.9
33	5.0335	158	586.87	283	6708.5
34	5.3229	159	602.11	284	6809.2
35	5.6267	160	617.66	285	6911.1
36	5.9453	161	633.53	286	7014.1
37	6.2795	162	649.73	287	7118.3
38	6.6298	163	666.25	288	7223.7
39	6.9969	164	683.10	289	7330.2
40	7.3814	165	700.29	290	7438.0
41	7.7840	166	717.83	291	7547.0
42	8.2054	167	735.70	292	7657.2
43	8.6463	168	753.94	293	7768.6
44	9.1075	169	772.52	294	7881.3
45	9.5898	170	791.47	295	7995.2
46	10.094	171	810.78	296	8110.3
47	10.620	172	830.47	297	8226.8
48	11.171	173	850.53	298	8344.5
49	11.745	174	870.98	299	8463.5
50	12.344	175	891.80	300	8583.8
51	12.970	176	913.03	301	8705.4
52	13.623	177	934.64	302	8828.3
53	14.303	178	956.66	303	8952.6
54	15.012	179	979.09	304	9078.2
55	15.752	180	1001.9	305	9205.1
56	16.522	181	1025.2	306	9333.4
57	17.324	182	1048.9	307	9463.1
58	18.159	183	1073.0	308	9594.2
59	19.028	184	1097.5	309	9726.7
60	19.932	185	1122.5	310	9860.5
61	20.873	186	1147.9	311	9995.8
62	21.851	187	1173.8	312	10133
63	22.868	188	1200.1	313	10271
64	23.925	189	1226.1	314	10410
65	25.022	190	1254.2	315	10551
66	26.163	191	1281.9	316	10694
67	27.347	192	1310.1	317	10838
68	28.576	193	1338.8	318	10984
69	29.852	194	1368.0	319	11131
70	31.176	195	1397.6	320	11279
71	32.549	196	1427.8	321	11429
72	33.972	197	1458.5	322	11581
73	35.448	198	1489.7	323	11734
74	36.978	199	1521.4	324	11889
75	38.563	200	1553.6	325	12046
76	40.205	201	1568.4	326	12204
77	41.905	202	1619.7	327	12364
78	43.665	203	1653.6	328	12525
79	45.487	204	1688.0	329	12688
80	47.373	205	1722.9	330	12852
81	49.324	206	1758.4	331	13019
82	51.342	207	1794.5	332	13187
83	53.428	208	1831.1	333	13357
84	55.585	209	1868.4	334	13528
85	57.815	210	1906.2	335	13701
86	60.119	211	1944.6	336	13876
87	62.499	212	1983.6	337	14053
88	64.958	213	2023.2	338	14232
89	67.496	214	2063.4	339	14412
90	70.117	215	2104.2	340	14594
91	72.823	216	2145.7	341	14778
92	75.614	217	2187.8	342	14964
93	78.494	218	2230.5	343	15152
94	81.465	219	2273.8	344	15342
95	84.529	220	2317.8	345	15533
96	87.688	221	2362.5	346	15727
97	90.945	222	2407.8	347	15922
98	94.301	223	2453.8	348	16120
99	97.759	224	2500.5	349	16320
100	101.32	225	2547.9	350	16521
101	104.99	226	2595.9	351	16825
102	108.77	227	2644.6	352	16932
103	112.66	228	2694.1	353	17138
104	116.67	229	2744.2	354	17348
105	120.79	230	2795.1	355	17561
106	125.03	231	2846.7	356	17775
107	129.39	232	2899.0	357	17992
108	133.88	233	2952.1	358	18211
109	138.50	234	3005.9	359	18432
110	143.24	235	3060.4	360	18655
111	148.12	236	3115.7	361	18881
112	153.13	237	3171.8	362	19110
113	158.29	238	3288.6	363	19340
114	163.58	239	3286.3	364	19574
115	169.02	240	3344.7	365	19809
116	174.61	241	3403.9	366	20048
117	180.34	242	3463.9	367	20289
118	186.23	243	3524.7	368	20533
119	192.28	244	3586.3	369	20780
120	198.48	245	3648.8	370	21030
121	204.85	246	3712.1	371	21286
122	211.38	247	3776.2	372	21539
123	218.09	248	3841.2	373	21803
124	224.96	249	3907

通常情况下水蒸汽是饱和蒸汽，就是在锅炉内，水被加热蒸发而产生。在有水的情况下，无论如何加热，得到的始终是饱和蒸汽。

但是如果将锅炉产出的饱和蒸汽输送出去，再次加热，由于没有液态水的补充，就会形成温度更高，但是不饱和的蒸汽，此时的蒸汽叫过热蒸汽。

蒸汽是化工生产过程的重要热力来源，过热蒸汽可以提供更高的加热温度。下表为过热蒸汽密度表。

压力（MPa）											温度（℃）
	150	170	190	210	230	250	270	290	310	330
0.1	0.5164	0.4925	0.4707	0.4507	0.4323	0.4156	0.4001	0.3857	0.3724	0.36
0.15	0.7781	0.7412	0.7079	0.6777	0.65	0.6246	0.601	0.5795	0.5594	0.5404
0.2	1.0423	0.9918	0.9466	0.9056	0.8684	0.8342	0.8027	0.7736	0.7465	0.7214
0.25	1.3089	1.2444	1.1869	1.1349	1.0849	1.0445	1.0048	0.9682	0.9343	0.9027
0.3	1.5783	1.499	1.4287	1.3653	1.3079	1.254	1.2077	1.1634	1.1224	1.0844
0.4	2.1237	2.0141	1.9166	1.8297	1.7513	1.678	1.6152	1.5554	1.5	1.449
0.5	2.6658	2.538	2.4121	2.2997	2.1992	2.1081	2.0255	1.9495	1.8802	1.8147
0.8	4.3966	4.1676	3.935	3.74	3.5374	3.411	3.2718	3.1453	3.0283	2.9215
1.1	6.1313	5.8332	5.5342	5.2356	4.981	4.746	4.5445	4.3612	4.1943	4.041
1.4	7.8785	7.5163	7.154	6.7913	6.4288	6.1147	5.8437	5.5945	5.3794	5.177
1.7	9.8464	9.3688	9.2473	8.413	7.9352	7.5219	7.1803	6.8607	6.5815	6.3309
2	11.6295	11.0985	10.5676	10.0366	9.5054	8.9744	8.0535	8.1447	7.8061	7.4955
2.5	15.189	14.4516	13.715	12.9776	12.2406	11.0536	10.8794	10.35	9.8888	9.4806
3	18.4168	17.5709	16.7243	15.8776	15.0367	14.1842	13.3377	12.6359	11.9979	11.5143
3.5	22.7008	21.5713	20.4427	19.3131	18.2266	17.053	15.9243	15.0163	14.2565	13.8501
4	27.164	25.747	24.3303	22.9129	21.4954	20.0778	18.6603	17.4997	16.5527	15.749
4.5	30.3852	28.9163	27.4475	25.9784	24.5096	23.0407	21.5717	20.1028	18.9333	17.9308
5	35.4243	33.6293	31.8342	30.0384	28.2433	26.4483	24.6532	22.858	21.4221	20.2508
6	43.8954	41.7475	39.5988	37.4508	35.302	33.1541	31.0062	28.8574	26.7091	25.0502
7	56.7201	53.6991	50.678	47.6561	44.6352	41.6133	38.5922	35.5704	32.5488	30.2231
8	65.4713	62.18	58.8883	55.5968	52.3061	49.0145	45.7231	42.4316	39.1399	35.8485
9	84.5457	79.8261	75.1061	70.3863	65.6665	60.9465	56.21	51.5077	46.7877	42.068
10	108.625	102.0289	95.4346	88.8412	82.2486	75.6543	65.7699	62.4676	59.6648	49.2802
12.5	158.3464	148.7516	139.1587	129.5629	119.9781	110.3842	95.7769	91.1964	81.6043	72.0105
15	206.4175	194.4276	182.4477	170.4577	158.4766	146.4967	127.682	122.5268	110.5369	98.5531
17.5	250.3934	236.691	222.8603	209.1592	195.4568	181.6261	163.428	154.2312	140.3919	126.6895
20	327.8165	309.9521	291.2953	273.4409	255.5786	236.9271	219.0574	201.2031	182.5462	164.6839
21.5	384.6647	363.2975	341.9027	320.5455	299.188	277.7931	256.426	235.0688	213.6739	192.3164

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