How does the amount of matter change when water changes state ?

Explanation:

According to law of conservation of matter, mass or matter can never be created nor it can be destroyed as it can only be transformed from one form to another.

For example, freezing of water changes liquid form of water into solid form.  

Therefore, state of matter can be changed but amount of matter will remain the same.

Thus, we can conclude that the amount of matter stays the same as water changes state.

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)