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A physical change affects the physical properties of an object or substance but not its chemical composition. For example, chopping wood is a physical change but burning wood is a chemical change. Physical properties include things like shape, form, state, strength, durability, structure, texture, size, color, volume and density. The following are common examples of a physical change.
A dust storm | A hair cut | Absorbing water with paper towel | Bending a stick | Blending flour and sugar together | Boiling water | Breaking a glass | Carving wood | Chipping a tooth | Chopping wood | Condensation of water on a cold glass | Cooling of magma into rock | Cracking an egg | Crumpling a piece of paper | Crushing a rock | Cutting an onion | Dissolving salt in water | Drying clothes on a line | Erosion of sand on a beach | Evaporation | Folding paper | Freezing an ice rink | Growth of sugar crystals in a jar of honey | Hammering a nail into wood | Heating a room | Jumping in a pool and becoming wet | Knitting mittens | Lighting a light bulb | Melting chocolate | Mixing candies together in a bowl | Mixing watercolor paints | Mowing a lawn | Painting on a canvas | Peeling potatoes | Polishing an apple with a cloth | Releasing the air pressure in a balloon | Sandpapering wood | Shaping clay | Sharpening a pencil | Shredding paper | Steam from a hot shower | Stirring cream into coffee | Stretching an elastic | Sublimation of dry ice | Tying a knot in a rope | |
Many, but not all, physical changes are reversible. For example, sugar that has been dissolved in water can be returned to a solid state when the water evaporates. In practice, some physical changes are effectively non-reversible. For example, if you carve wood it is generally not possible to put the shavings back on the wood as wood is organic and can't necessarily be mechanically recreated.
Science
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