norepinephrine
chem. A hormone which is released by the adrenal medulla and by the sympathetic nerves and functions as a neurotransmitter. It is also used as a drug to raise blood […]
normal force
phys. Component of support force perpendicular to a supporting surface. For an object resting on a horizontal surface, it is the upward force that balances the weight of the object. […]
normal line
phys. The normal line is the line drawn perpendicular to the reflective surface of a mirror, or the boundary where refraction occurs (such as the surface of a lens) at […]
north pole
phys. The northern end of the earth’s axis of rotation, a point in the Arctic Ocean. སའི་གོ་ལའི་རང་འཁོར་སྲོག་ཤིང་གི་བྱང་ཕྱོགས་ཀྱི་སྣེ་སྟེ། བྱང་སྣེ་རྒྱ་མཚོའི་ནང་གི་ཚེག་ཅིག