T? li?ng-chu bu?t-li-ha?k kap lia?p-chu bu?t-li-ha?k , spin s? ki-pun lia?p-chu , ho?k-ha?p lia?p-chu ( hadron ), kap goan-chu-hu?t so? k?aⁿ e chi?t chiong l?i-ch?i e kak-?n-t?ng-li?ng (角運動量). Spin chit e su s? tui Eng-gi e "spin" ti?t-chiap chioh--lai, i-su s? "iⁿ-iⁿ-go".

Spin s? li?ng-chu le?k-ha?k tiong nn?g chiong kak-?n-t?ng-li?ng e s? ki-tiong chi it, so?-i ?-si choan-chheng spin kak-?n-t?ng-li?ng , l?ng-g?a chi?t-e s? kui-t? kak-?n-t?ng-li?ng (軌道角運動量). Kui-t? kak-?n-t?ng-li?ng operator ti? siong-tong i ko?-tian le?k-ha?k tiong mi?h-ki?ⁿ teh t?g-se?h e kak-?n-t?ng-li?ng; po-ham-so? t? khong-kan tiong sui kak-t?? pian-hoa e si, kui-t? kak-?n-t?ng-li?ng ti? ? chhut-hi?n. M?-ko spin bo-kang, i bo t?i-piau lia?p-chu si?t-che t? khong-kan tiong ? teh t?g-se?h, kan-na T?-kiu teh ch?-choan ia?h-s? kan-lo?k teh go. Spin s? lia?p-chu pun-sin so? k?-p?--e, kap i e ti?n-h? , chit-li?ng sio-k?ng.

Ti?n-chu e spin kak-?n-t?ng-li?ng e chun-ch?i s? iu si?t-gi?m thui-l?n--chhut-lai, chhi?ⁿ-kong Stern?Gerlach si?t-gi?m . M?-ko che m? ?-sai iu li-l?n thui-l?n--chhut-lai, phi-l?n-kong spin thong-ke t?ng-li ia?h-s? Pauli bo-cho-hoe goan-li (Pauli 無做?原理).

? chi?t-koa lia?p-chu, chhi?ⁿ photon , in e spin t? so?-ha?k si?ng ?-tang i?ng hiong-li?ng lai piau-ta?t. Ki-tha e lia?p-chu, chhi?ⁿ ti?n-chu , in e spin ai i?ng spinor ia?h-s? bispinor lai piau-ta?t.