Oxygen Solubility Water

Reference data and engineering information about oxygen solubility water for miscellaneous applications.

oxygensolubilitywater

Overview

Engineering reference data for Oxygen Solubility Water in miscellaneous.

Key Formulas

Unit Conversion

$y = x \cdot k$

Multiply by conversion factor.

Linear Interpolation

$y = y_1 + \frac{(x - x_1)(y_2 - y_1)}{x_2 - x_1}$

Estimate between two known points.

Percentage

$p = \frac{\text{part}}{\text{whole}} \times 100\%$

Part as fraction of whole.

Variables

Symbol	Description	Unit
$x$	Input value	—
$y$	Output value	—
$k$	Conversion factor	—

Oxygen Solubility Data

Fresh Water (Salinity ~0)

11 rows

Oxygen solubility in fresh water (salinity ~0) at various temperatures and pressures (1, 2, 4 bar absolute).
Temperature(°C)	Temperature(°F)	1 bar(μMol)	1 bar(mg/l)	2 bar(μMol)	2 bar(mg/l)	4 bar(μMol)	4 bar(mg/l)
0	32	457	14.6	913	29.2	1823	58.4
5	41	399	12.8	798	25.5	1595	51.1
10	50	353	11.3	705	22.6	1411	45.1
15	59	315	10.1	630	20.2	1260	40.3
20	68	284	9.1	568	18.2	1137	36.4
25	77	258	8.3	517	16.5	1034	33.1
30	86	236	7.6	473	15.2	947	30.3
35	95	218	7	436	14	872	27.9
40	104	202	6.5	404	12.9	808	25.9
45	113	189	6	375	12	751	24
50	122	177	5.6	355	11.3	710	22.7

Source: engineeringtoolbox.com

Seawater (Salinity ~35 ppt)

11 rows

Oxygen solubility in seawater (salinity ~35 ppt) at various temperatures and pressures (1, 2, 4 bar absolute).
Temperature(°C)	Temperature(°F)	1 bar(μMol)	1 bar(mg/l)	2 bar(μMol)	2 bar(mg/l)	4 bar(μMol)	4 bar(mg/l)
0	32	349	11.2	699	22.4	1399	44.8
5	41	308	9.9	616	19.7	1233	39
10	50	275	8.8	550	17.6	1099	35.2
15	59	248	7.9	495	15.9	991	31.7
20	68	225	7.2	450	14.4	901	28.8
25	77	206	6.6	413	13.2	826	26.4
30	86	190	6.1	381	12.2	761	24.4
35	95	176	5.6	353	11.3	706	22.6
40	104	165	5.3	329	10.5	658	21.1
45	113	154	4.9	308	9.9	616	19.7
50	122	146	4.6	292	9.4	585	18.7

Source: engineeringtoolbox.com

Key Concepts & Notes

Salinity Definitions

Seawater Salinity: Ranges from 30 to 50 parts per thousand (ppt), with an average of 35 ppt.
- 35 ppt is equivalent to:
  - $35\ \text{g dissolved salt per kg of seawater}$
  - $35 \text{ ppt} = 35 \text{ o/oo} = 3.5\% = 35{,}000\ \text{ppm}$
Brackish Water: Water with salinity between that of freshwater and seawater.

Dissolved Oxygen from Air

In air with normal composition, the oxygen partial pressure is approximately 20% of the total atmospheric pressure.
Consequently, the dissolution of oxygen from air is 20% of the solubility value given for pure oxygen at the same total pressure.

General Solubility Trends

Pressure Effect: Oxygen solubility increases linearly with increasing pressure, as described by Henry's Law.
Temperature Effect: Oxygen solubility decreases as temperature increases.
Salinity Effect: Oxygen solubility decreases significantly with increasing salinity. For a given temperature and pressure, seawater holds less dissolved oxygen than fresh water.

Interactive Charts

Oxygen - solubility in fresh and sea Water

Gases Solved in Water - Diffusion Coefficients

References

Original Source

Source: engineeringtoolbox.com