Physics students’ construction and checking of differential volume elements in an unconventional spherical coordinate system Benjamin P. Schermerhorn and John R. Thompson Phys. Rev. Phys. Educ. Res. 15, 010112 In upper-division physics courses, students’ use of differential line, area, and volume elements and their facility with the various multivariable coordinate systems consistently go hand in read more Ben and John write about differential volume elements in unexpected coordinates