Examples of Physical Changes

We explain that what are examples of physical changes? physical change is the comparison between the final state and the initial state of matter, when it has undergone a transformation in its appearance or in the organization of its particles. This transformation may be due to environmental conditions, the influence of machines or human action, and is totally unrelated to chemical phenomena. The type of matter remains the same , but it behaves in different ways when manipulated.

It is through physical changes that substances appear as solids, liquids or gases, without altering their chemical composition or participating in a reaction. Thus, they can be more easily involved in mixtures with other substances to produce materials with mixed properties. The environmental factors that influence physical change are pressure and temperature .

What are the physical changes?

Physical changes occur through a wide variety of processes, some natural and others achieved with technology. Among the main physical changes are:

  • Fusion : passage from the solid state to the liquid state, by heating.
  • Evaporation : passage from the liquid state to vapor or gas, by heating.
  • Condensation : passage from the state of vapor to liquid, by cooling.
  • Solidification : transition from a liquid to a solid state, by cooling.
  • Sublimation : passage from the solid to the gaseous state directly, by heating.
  • Size reduction : when a solid is converted to smaller particles.
  • Concentration – A mixture that has two or more different substances becomes concentrated when a little more solute is added to it.

30 examples of physical changes

  1. Ice is solid water. When a cube is placed in the sun or on a hot grill, it will melt into liquid water.
  2. If the liquid water contained in a glass is put in the freezer, it will suffer a great drop in temperature, going to the solid state in a solidification.
  3. When a gigantic rock undergoes crushing, it turns into smaller solid pieces.
  4. When the pieces of that rock in the previous example are subjected to grinding, they will turn into very fine particles or dust.
  5. When dry ice (solid carbon dioxide) is exposed to room temperature, it transforms directly to gas in a sublimation.
  6. The glass to be recycled is first crushed to a fine powder.
  7. When old glass is reused to produce new glass, it melts from a solid state to a liquid state.
  8. A glass tumbler with a cold drink has a cold outer surface. The water vapor from the environment will condense there, turning into drops of water that will drip down to the base of the glass.
  9. In freezing weather, home windows are cold on the outside and hot on the inside. Therefore, the moisture inside, in the form of vapor, creates a thin layer of liquid moisture, which can begin to drip.
  10. Solid iron is placed in a cast iron pan, to raise the temperature to thousands of degrees centigrade and turn it into liquid iron, to combine it with more elements and create steel.
  11. Pieces of solid zinc are placed in a casting pan. The temperature will be raised enough to turn them into liquid zinc, and thus pour it into molds to create solid state zinc ingots.
  12. Solid state copper is added to a smelting pan, and a portion of tin, also solid, is added. The temperature rises high enough for the two metals to melt and their liquids to combine. This uniform mixture will be solid bronze when allowed to cool.
  13. When sugar is added to drinking water, it creates a liquid mixture with the properties of both. These substances remain chemically stable and unreacted.
  14. When aluminum is subjected to temperatures above 660 ° C, it melts from a solid state to a liquid state.
  15. Mercury is a metal that is liquid at room temperature. When another element is added, such as gold, it absorbs it to form a mixture called amalgam.
  16. When gold is heated to temperatures above 1063 ° C, it melts, going from the solid state to the liquid state.
  17. When gypsum mineral is crushed, it turns into smaller pieces of the same material, without altering anything other than its size.
  18. When pieces of gypsum mineral are ground, they turn into gypsum powder.
  19. When the wood is passed through a saw, it is divided into several segments in a specific way. This does not alter its chemical composition.
  20. When rubber is subjected to traction, friction or pressure, it deforms or splits.
  21. When heated, the iron becomes more malleable, allowing it to be shaped into other geometric shapes when struck.
  22. When wooden boards are damp, this material swells because water is sandwiched between its fibers.
  23. When water is heated above 100 ° C, it reaches its boiling point and gradually turns into steam.
  24. When oxygen is cooled below -222.8 ° C, it turns into liquid oxygen.
  25. When chromium and vanadium are fused together in a pan and melted at high temperatures, they are poured into molds to form tools like wrenches.
  26. The thermal expansion of metals. When the temperature increases, they expand to cover more volume.
  27. Ethyl alcohol has its boiling point at 78.5 ° C, lower than that of water, which indicates that it is a volatile compound.
  28. Copper is a ductile metal, which allows pressure and force to be applied to convert it into wires for electrical conduction.
  29. The fatigue of the metal, which occurs when bending it quickly many times, causing it to become brittle and eventually break, after being subjected to those forces and reaching beyond its natural flexibility.
  30. The evaporation of seawater by action of light and heat from the sun.

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