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Dissolved Oxygen in the River. Solubility of gases. Depends on three factors: 1) temperature 2) pressure 3) aeration. Temperature. If you increase the temperature you decrease the solubility of a gas. Pressure. If you increase the pressure you increase the solubility of a gas.

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solubility of gases
Solubility of gases

Depends on three factors:

1) temperature

2) pressure

3) aeration

temperature
Temperature

If you increase the temperature you decrease the solubility of a gas.

pressure
Pressure

If you increase the pressure you increase the solubility of a gas.

-example- pop cans-

When you open it the pressure decreases so the gas fizzes out.

aeration
Aeration

Mixing or movement causes more gas to dissolve because of increased surface area exposed to the gas.

dissolved o 2 and n 2 in water
Dissolved O2 and N2 in water
  • Too little oxygen- fish die
    • -caused by many hot days is a row
    • - oxygen levels fall below lower limit for survival.
slide7

Too much oxygen and nitrogen (110% to 124% saturation)

    • Gas bubble disease
    • Nitrogen-gas bubbles block the flow of blood.
    • Diagnosed by gas bubbles in the gills of the dead fish
    • Can occur at the base of a dam.