What are the Properties of Water? Definition of Water
What is the definition of water? It is the fluid which descends from the clouds in rain, and which forms rivers, lakes, seas, etc. The Physical and Chemical Properties are the characteristics of a substance, like water, which distinguishes it from any other substance. Most common substances, like water, exist as States of Matter as solids, liquids, gases and plasma. The solid phase of water is known as ice or snow. The gaseous phase of water is known as water vapor or steam - see the Phase Changes link above.
Water Properties - Why is water unique
Water is unique because it is the only natural substance that can exist in three states of matter - solid, liquid, and gas - at the temperatures normally found on Earth.