Some questions of fluid volume

I built a box without top, and an inlet above it. The fulid will fill the box. I try to set inlet a small flux(0.0223m3/s), but I found some problems. I hope someone could explain.

  1. the number of fluid particles mutiply the Vol of fluid particles doesn't equal to the volume of all fluid(total volume of fluid in the box).
  2. Fluid particles come out of inlet with diffrent velocity don't have same volume even they have same number. For example: an inlet with 0.9m/s velocity in 10 sec have same particles as an inlet with 1.8m/s velocity in 5 sec, but when the fluid fall in to the box, they have different liquid level, in another words the volumes are different.
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