The concentration of oxygen leaving an oxygen concentrator depends on the:
a. number of sieves in the unit.
b. number of compressors used.
c. set flow rate of the gas exiting.
d. size of the sodium-aluminum silicate pel-lets.
ANS: C
Atmospheric gases diffuse through the membrane at different rates. The rate at which a gas dif-fuses depends on its diffusion constant and solubility for the plastic membrane and the pressure gradient for the gas across the membrane.
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