Physical change

Physical change

All chemical substances consist of one or more elements. Sometimes, changes occur only in the physical conditions of a substance leaving its chemical structure unchanged. This is called a physical change.

Physical change examples

A solid piece of ice, if kept at room temperature, absorbs heat from the environment and gradually melts into liquid water. Again, heating liquid water up to 100°C will see the water vaporize into the air. Here, all the molecular formulas of all three - water, ice, and vapor are the same - H2O. 

That means each molecule of them has the same two hydrogen and one oxygen atoms in them. Therefore, all three substances are the same, only their physical states are different - ice solid while water is liquid and vapor is gaseous. This kind of change is called a physical change.

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