Why can a liquid change to take the shape of its container but not expand to fill the container itself?

What are the phases shown in a and d called?

When is a current produced? when the terminals of an electrochemical cell are connected by a wire if the electric circuit is opened in an electrochemical cell if the electrolyte is removed from an electrochemical cell when the electrodes are reversed in an electrochemical cell

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.