CHIR114 Lecture Notes - Lecture 3: Thermal Conductivity, Thermal Expansion, Electromagnetic Radiation
22 Aug 2018
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16th of august 2018: physics lecture heat transfer and the laws of. Fast moving particles in the hot object collide with slow moving particles in the cold object and cause them to speed up, transferring thermal energy to them. The rate of heat flow is proportional to; Air acts as an insulator in houses, clothing, fur and snow. Occurs when objects are surrounded by fluids like air or water. Fluid in contact with a hot object becomes warm and its density decreases due to thermal expansion. It is displaced by cooler fluid and carries thermal energy to a cooler place or object. For example: thermals in air, wins, water rising in a pan. Transfers heat even when objects are surrounded by vacuum. Electromagnetic radiation includes all wavelengths to gamma. For example: heat from the sun: newton"s law of cooling: between the object and its surroundings. Rate of cooling or warming of an object depends on the temperature difference,
