Re-arranging the equation leads to E Ψ Ψ = i ℏ ℏ ∂ ∂ Ψ Ψ ∂ ∂ t , where the energy factor E is a scalar value, the energy the particle has and the value that is measured. The partial derivative is a linear operator so this expression is the operator for energy: E ^ ^ = i ℏ ℏ ∂ ∂ ∂ ∂ t .