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प्रश्न
______ of heat does not require a medium.
विकल्प
radiation
white
conduction
blue
convection
bad conductor
good conductor
black
reflection
उत्तर
Convection of heat does not require a medium.
Explanation:
In convection, when the temperature of a substance increases due to heat, its molecules move faster, causing them to rise. As a result, cooler and denser objects sink to the bottom. This process is possible only when a substance (liquid or gas) is present, as it requires the mobility and movement of molecules.
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