Air - Humidifying with Steam, SI units

Using steam to humidify air.

The amount of vapor in 100 m³air volume is indicated below.

Air Humidifying with Steam - Imperial Units

For full table - rotate the screen!

Air - Humidifying with Steam - SI units
Dry Bulb Temperature (^oC)	Vapor in Air (kg per 100 m³air)
	Relative Humidity (%)
	100	85	80	75	70	65	60	55	50	45	40	35	30
32	3.39	2.89	2.72	2.55	2.38	2.19	2.04	1.93	1.7	1.53	1.36	1.19	1.02
31	3.22	2.73	2.57	2.41	2.25	2.1	1.93	1.77	1.61	1.45	1.29	1.13	0.97
30	3.05	2.59	2.44	2.29	2.13	1.97	1.83	1.67	1.52	1.37	1.22	1.07	0.91
29	2.89	2.45	2.31	2.17	2.02	1.88	1.73	1.59	1.45	1.3	1.16	1.01	0.87
28	2.73	2.32	2.19	2.05	1.91	1.78	1.64	1.5	1.37	1.23	1.1	0.96	0.82
27	2.59	2.2	2.07	1.94	1.81	1.68	1.55	1.42	1.29	1.16	1.03	0.91	0.78
26	2.45	2.08	1.96	1.83	1.71	1.59	1.47	1.34	1.22	1.1	0.97	0.86	0.73
25	2.31	1.97	1.85	1.73	1.62	1.5	1.39	1.27	1.16	1.04	0.93	0.81	0.69
24	2.19	1.86	1.75	1.64	1.53	1.42	1.31	1.2	1.09	0.98	0.87	0.77	0.66
23	2.06	1.76	1.63	1.55	1.45	1.34	1.24	1.14	1.03	0.93	0.83	0.72	0.62
22	1.95	1.66	1.56	1.46	1.36	1.27	1.17	1.07	0.98	0.88	0.78	0.68	0.59
21	1.84	1.56	1.47	1.38	1.29	1.2	1.1	1.02	0.92	0.83	0.74	0.67	0.55
20	1.74	1.48	1.39	1.3	1.22	1.13	1.04	0.98	0.87	0.78	0.69	0.61	0.52
19	1.63	1.39	1.31	1.23	1.15	1.06	0.98	0.9	0.82	0.74	0.65	0.57	0.49
18	1.54	1.31	1.24	1.16	1.08	1	0.93	0.85	0.77	0.69	0.62	0.54	0.46
17	1.45	1.24	1.16	1.09	1.02	0.94	0.87	0.8	0.73	0.65	0.59	0.51	0.44
15	1.29	1.1	1.03	0.97	0.9	0.84	0.77	0.71	0.66	0.58	0.52	0.45	0.39
10	0.94	0.8	0.76	0.71	0.66	0.61	0.57	0.52	0.47	0.43	0.38	0.33	0.28
0	0.49	0.41	0.39	0.37	0.34	0.32	0.29	0.27	0.24	0.22	0.2	0.17	0.15
-5	0.33	0.28	0.26	0.25	0.23	0.21	0.2	0.18	0.16	0.15	0.13	0.11	0.1
-10	0.22	0.18	0.17	0.16	0.15	0.14	0.13	0.12	0.11	0.1	0.09	0.08	0.06

Note! In a psychrometric chart or in a Mollier diagram the amount of vapor humidity ratio - x - is indicated in kg/kg_{dry air}(kg vapor per kg dry air). The values above can be transformed to kg/kg_{dry air} by dividing the values with the air density at the actual temperature.

Download Water vapour in air vs. relative humidity and dry bulb temperature chart

Example - Humidifying Air with Steam

humidifying air with steam (or water) in the Mollier diagram

Air at 20 ^oC and 30% relative humidity are humidified to 20 ^oC and 80% relative humidity.

From the table above it can be estimated that air at 20 ^oC and 30% relative humidity contains 0.52 kg water vapor per 100 m³ air volume. Air at 20 ^oC and 80% relative humidity contains 1.39 kg per 100 m³ air volume.

The amount of water vapor required per 100 m³ air volume can be calculated like

Amount of Water Vapor

= (1.39 kg/100 m³ air volume) - (0.52 kg/100 m³ air volume)

= 0.87 (kg/100 m³ air volume)