# The variation of physical quantities with position

**URL:** https://discourse.paraview.org/t/the-variation-of-physical-quantities-with-position/15676
**Category:** ParaView Support
**Tags:** vtk
**Created:** [November 2, 2024, 1:48am UTC](https://discourse.paraview.org/t/the-variation-of-physical-quantities-with-position/15676 "2024-11-02T01:48:16Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Guanlong](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/g/82dd89/32.png) [@Guanlong](https://discourse.paraview.org/u/Guanlong)
#### Post date: [November 2, 2024, 1:48am UTC](https://discourse.paraview.org/t/the-variation-of-physical-quantities-with-position/15676/1 "2024-11-02T01:48:16Z")

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Hello, researchers. As shown in the figure, how can I obtain the variation of voidfraction on this section with the axial X position? Thank you very much.

 ![1730511832898](https://discourse.paraview.org/uploads/default/original/2X/f/f6a4e906efdf7a660fdcece2c0f7ccd68f18f73b.png)

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### Author: ![cory.quammen](https://discourse.paraview.org/user_avatar/discourse.paraview.org/cory.quammen/32/11193_2.png) [@cory.quammen](https://discourse.paraview.org/u/cory.quammen)
#### Post date: [November 4, 2024, 11:19am UTC](https://discourse.paraview.org/t/the-variation-of-physical-quantities-with-position/15676/2 "2024-11-04T11:19:52Z")

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[**Plot Over Line**](https://docs.paraview.org/en/latest/Tutorials/ClassroomTutorials/beginningPlotting.html#plot-along-a-line) could be useful to you. Set one point at the minimum X position and the other point at the maximum X position. That will give you a plot of voidfraction vs. x.