Change of State refers to the process by which a substance transforms from one state of matter to another, such as solid to liquid, liquid to gas, or vice versa, due to changes in temperature or pressure.
In GCSE Physics, understanding changes of state is essential as it involves concepts like energy transfer, where heat is typically absorbed or released during the transformation.
Key examples include melting, freezing, boiling, condensation, and sublimation. During a change of state, the temperature of the substance remains constant while it absorbs or releases latent heat. This process is crucial for explaining various physical phenomena and applications, such as the water cycle and refrigeration.
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