GENERAL KNOWLEDGE

Detailed explanation-1: -Water is the only common substance that is naturally found as a solid, liquid or gas.

Detailed explanation-2: -For many centuries, it was considered that there were only three states of matter: solid, liquid and gas (the three that are present and stable in our world). And water is the substance that best represents them, because it is the only one that exists naturally in the three states.

Detailed explanation-3: -Water can occur in three states: solid (ice), liquid, or gas (vapor). Solid water-ice is frozen water. When water freezes, its molecules move farther apart, making ice less dense than water. This means that ice will be lighter than the same volume of water, and so ice will float in water.

Detailed explanation-4: -Water is the only substance on Earth that occurs naturally as a solid, liquid, and gas. But scientists can artificially transform substances that occur naturally in only one or two forms of matter into other forms.