Moist Air - Weight of Water Vapor

Sponsored Links

Grains of moisture per pound of dry air at standard atmospheric pressure at relative humidity ranging 10 - 90% are indicated below.

Moist Air - Weight of Water Vapor
Relative Humidity (%)	Water Vapor in Air (grains^ water vapor per pound dry air*)
	Temperature
	(^oC)
	-1	4	10	16	21	27	32	38
	(^oF)
	30	40	50	60	70	80	90	100
10	3	4	6	8	11	16	21	29
20	5	7	10	16	21	30	42	58
30	7	11	14	22	34	46	65	87
40	9	14	20	30	44	62	85	116
50	12	18	26	39	55	78	108	147
60	14	22	32	48	66	92	128	176
70	17	26	38	54	78	108	152	208
80	19	29	42	62	88	125	173	-
90	21	33	48	70	100	140	190	-

^*grains of water is commonly used in psychrometrics

1 grain = 0.000143 lb_m = 0.0648 g (7000 grains per lb_m)

Same table as above with water vapor in "pounds water vapor per pound dry air".

Moist Air - Weight of Water Vapor
Relative Humidity (%)	Water Vapor in Air (pounds water vapor per pound dry air)
	Temperature
	(^oC)
	-1	4	10	16	21	27	32	38
	(^oF)
	30	40	50	60	70	80	90	100
10	0.0004	0.0006	0.0009	0.0011	0.0016	0.0023	0.0030	0.0041
20	0.0007	0.0010	0.0014	0.0023	0.0030	0.0043	0.0060	0.0083
30	0.0010	0.0016	0.0020	0.0031	0.0049	0.0066	0.0093	0.0124
40	0.0013	0.0020	0.0029	0.0043	0.0063	0.0089	0.0122	0.0166
50	0.0017	0.0026	0.0037	0.0056	0.0079	0.0112	0.0154	0.0210
60	0.0020	0.0031	0.0046	0.0069	0.0094	0.0132	0.0183	0.0252
70	0.0024	0.0037	0.0054	0.0077	0.0112	0.0154	0.0217	0.0297
80	0.0027	0.0041	0.0060	0.0089	0.0126	0.0179	0.0247	-
90	0.0030	0.0047	0.0069	0.0100	0.0143	0.0200	0.0272	-

Related Documents

Air - Composition and Molecular Weight

Dry air is a mechanical mixture of nitrogen, oxygen, argon and several other gases in minor amounts.

Air - Density vs. Pressure and Temperatures

Air density at pressure ranging 1 to 10 000 bara (14.5 - 145000 psi) and constant selected temperatures.

Air - Density, Specific Weight and Thermal Expansion Coefficient vs. Temperature and Pressure

Online calculator, figures and tables showing density, specific weight and thermal expansion coefficients of air at temperatures ranging -100 to 1600 °C (-140 to 2900 °F) at atmospheric and higher pressure - Imperial and SI Units.

Air - Diffusion Coefficients of Gases in Excess of Air

Diffusion coefficients (D₁₂) for gases in large excess of air at temperatures ranging 0 - 400 °C.

Air - Dynamic and Kinematic Viscosity

Online calculator, figures and tables with dynamic (absolute) and kinematic viscosity for air at temperatures ranging -100 to 1600°C (-150 to 2900°F) and at pressures ranging 1 to 10 000 bara (14.5 - 145000 psia) - SI and Imperial Units.

Air - Moisture Holding Capacity vs. Temperature

The moisture holding capacity of air increases with temperature.

Air - Prandtl Number

Prandtl number for air vs. temperature and pressure.

Air - Properties at Gas-Liquid Equilibrium Conditions

Properties of air change along the boiling and condensation curves (temperature and pressure between triple point and critical point conditions). An air phase diagram included.

Air - Specific Heat vs. Pressure at Constant Temperature

Figures and tables with isobaric (Cp) and isochoric (Cv) specific heat of air at constant temperature and pressure ranging 0.01 to 10000 bara.

Air - Thermal Conductivity vs. Temperature and Pressure

Online calculator with figures and tables showing air thermal conductivity vs. temperature and pressure. SI and imperial units.

Air - Thermal Diffusivity vs. Temperature and Pressure

Figures and tables withdry air thermal diffusivity vs. temperarure and pressure. SI and Imperial units.

Dry Air - Thermodynamic and Physical Properties

Thermodynamic properties of dry air - specific heat, ratio of specific heats, dynamic viscosity, thermal conductivity, Prandtl number, density and kinematic viscosity at temperatures ranging 175 - 1900 K.

Heat Recovery Efficiency

Classification of heat recovery efficiencies - temperature efficiency, moisture efficiency and enthalpy efficiency - online heat exchanger efficiency calculator.