cac chat cau tao gian doan va gom 1 so lon cac phan tu

cac phan tu chuyen dong hon loan k ngung, cuong do chuyen dong phan tu bieu hien nhiet luong cua he

kick thuoc phan tu rat nho so voi khoang cach giua chung. co the coi phan tu la chat diem tron tinh toan

cac phan tu k tuong tac ,chi va cham theo co hoc newton

Ab dung voi moi chat, cd dung voi khi li tuong