The teapot belongs to the communication device, and the same liquid is still in the communication device, and the liquid level of each part in direct contact with the atmosphere is always at the same level. It can be seen from the figure that the liquid level on the surface of the spout and teapot is not equal, and the water level in the teapot is low, but water can be poured, which violates the principle of communicator.

So the answer is:

(1) The liquid level of the nozzle and the surface is not equal.

(2) the principle of communication device