Chap 13 and 14 compiled
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Density decreases when volume increases while mass stays the same. Temperature variations in fluids cause density differences that create convection currents, with cold air sinking and hot air rising, as seen in refrigerators where coils on top allow this. Radiation transfers heat without a medium, with good absorbers also being good emitters while poor absorbers are good reflectors, and greater temperature differences result in more heat radiated per second, as reduced in vacuum flasks where lids prevent convection but also reduce conduction.
Chap 13 and 14 compiled
- 1. Density lower = Mass (Mass is fixed)/ Volume higher Density differences caused by temperature variations in the fluid create a movement called convection current. Refrigerator: coil on top let cold air sink, hot air rise. Radiation – no medium (object, material, matter) Good absorbers are good emitters / good radiators (dark, black, rough) Poor absorbers are poor emitters / good reflectors (shining, bright, smooth) The greater the temperature difference, the more heat is radiated per second. Vacuum flask – lid prevent convection but reduce conduction