# X's expectation value in quantum physics

When I'm in a dimension higher than 1, do I need to integrate over all space (V) or only the x axis?

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dextercioby
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Palindrom said:
When I'm in a dimension higher than 1, do I need to integrate over all space (V) or only the x axis?
$\psi (x,y,z)$.You wish to calculate the expectation value for $\hat{x}$.That is nothing but the number.
$$<\hat{x}> =\int\int\int_{R^{3}} \psi^{*}(x,y,z) x \psi (x,y,z)$$