Temperature

All the above processes are, of course, affected by the temperature. The transfer rate KL becomes higher when the temperature of the water is raised. The most important reason for this seems to be the fact that at higher temperature the velocity of molecular vibrations is increased. This allows oxygen to diffuse molecularly to a greater depth in an equal time. Generally, the transfer rate as a function of temperature is given in the following form:

with KL,T and KL,20 as the transfer velocities at temperature T (given in °C) and at the reference temperature of 20 °C, respectively. In practice, a value of a = 1.024 is used for oxygen.

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