Why does water change into ice and the quality remains the same Please say why it doesn't change. Please explain in detail. Thank you

Why does water change into ice and the quality remains the same Please say why it doesn't change. Please explain in detail. Thank you

This problem can be explained from a microscopic point of view. When water is in liquid state, the gap between water molecules is large, so it has good fluidity. When water becomes ice, the gap between water molecules will be reduced, and the molecules will become close. At this time, the liquid water becomes solid ice. But in this process, the number of water molecules does not lose, that is, the number of water molecules remains unchanged, So the mass of water to ice is constant