Question about bridge circuits

Hello all,

I am a complete electronic newbie. So, sorry if this question is lame
or trivial.

I am looking at a bridge circuit and it has 4 leads... 2 for power and
2 for output. It is used as a pressure measurement sensor.

Now, the output is taken as a difference of these two signals. My
question is why do we take the difference? Why not take the absolute
value of one signal?

Thanks,
Luca
.

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