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Residence time is the time it takes a particle to complete the cycle.

Space time is volume of the reactor over the velocity.

If the volume does not change and the velocity remains constant then Residence time = space time, however, if there is a disturbance in the reactor (i.e., change in pressure, temp, ect.), then residence time does not equal to space time.

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Q: What is Difference between residence time and space time?
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