Here are the three physical states of matter and its state changes
1.Sublimation 2.Resublimation 3.Condensation 4.Vaporisation 5.Fusion 6.Solidification
- Boiling of the water is a vaporisation. - The dry ice (solid carbon dioxide) sublimes at room temperature. - The formation of frost on the windows of cars is a resublimation of steam. - The condensation on the lenses of the glasses is a condensation of the steam. - The formation of hail from raindrops is solidification. - The "disappearance" of ice cubes in lemonade is a fusion
Color, hardness, electrical conductivity, magnetism, density, etc. .. are the physical properties that characterize materials. These properties can be measured and quantified accurately.
A transformation that keeps the physical properties (color, hardness, electrical conductivity, magnetism, density, etc. ..) is a physical transformation.
- We drop a piece of iron. The physical properties remain the same (the iron remains iron!). It is a physical transformation. - A piece of iron is heated to red. After cooling, the physical properties did not change (the iron remains iron!). It is a physical transformation.
A transformation that permanently alters the physical properties is a chemical transformation.
- The formation of rust from iron is a chemical transformation (Rust is not metallic iron!). - Sugar burns, leaving a black residue. (Coal is not sugar!). This is a chemical transformation.