Ruler Not Keeping Absolute Measurement

I was under the impression that the rulers across the top and bottom of the canvas were measuring the length and width of the window at the given resolution.
However, this can't be the case, because I notice that when I crop a photo down from a width of 70 to a width of 20 on the ruler, when the crop finishes, the width of the canvas is back to looking like 70, so the ruler is not absolute, but some kind of relative measure?
Can someone explain what this means?  And is there a way to get an absolute ruler either of any unit? It would help for what I'm trying to do.

The cropped image can be the same physical size as the original if it is being resampled and/or if its ppi is being changed. Check your Crop Tool settings by pressing R key after clicking on image with the tool.
Right-click on a ruler to get a choice of units.

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