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    I know how to work out the partial pressure, e.g. of oxygen in air, by doing the fractional occupancy of oxygen multiplied by the barometric pressure.

    Apparently po2 in water is the same, but I don't understand why. Help with this part please
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    Because its exposed to the same air. So the partial pressure will be the same. If it wasn't, then oxygen would flow into the water until pressure was evened out. That's how pressure works - its the amount of 'push'.

    Do remember that partial pressure is very different to the actual amount of oxygen. There is very little oxygen dissolved in water itself (hence why we need haemoglobin in blood) - its just that the 'push' (pressure) of that gas is the same.
 
 
 
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