The linear momentum operator of quantum mechanics is expressed as p=ħ∂/i∂x where ħ is Planck’s constant of action divided by 2π, i is the imaginary unit, and ∂/∂x is the partial derivative with respect to one component of 3-space. The Hamiltonian energy operator is expressed as H=-ħ∂/i∂t. It is a negative operator where ∂/∂t is now the partial derivative with respect to time.
Using these operators, the expectation of both linear momentum and Hamiltonian energy can be expressed as the weighted means sum over all of the plane waves making up the wavefunction Ψ, which is a function both of 3-space and of time: <p>=ſ Ψ(x,t)*p Ψ(x,t) dx / ſ Ψ(x,t)*Ψ(x,t) dx and <H>=ſ Ψ(x,t)*H Ψ(x,t) dx / ſ Ψ(x,t)*Ψ(x,t) dx .


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