Physical change which envolves heat?
Asked by Anuradha | 6th Oct, 2014, 03:03: PM
Physical changes are changes that affect the form of a substance, but not its chemical composition. A physical change involves a change in physical properties like melting, textural change, change in shape, size, colour, volume and density.
Examples: Burning of candle, melting of ice, boiling of water etc.
Burning of candle is a physical change that evolves heat. When the candle is lit, the heat of the flame melts the solid wax of the candle to liquid wax. There occurs a change from solid state to liquid state. As the wax melts, the size of the candle goes on decreasing. It then solidifies and assumes a different shape and dimensions altogether.
Answered by Sheetal Kolte | 6th Oct, 2014, 08:15: PM
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