Two identical bowls of casserole need to bekept warm. The cook covers bowl 1 with transparent plastic wrapand bowl 2 with shiny aluminum foil, in each case trapping a layerof air between the covering and the casserole. (a) After a few minutes, will the temperature of casserole 1 be greater than, less than,or equal to the temperature of casserole 2? (b) Choose the bestexplanation from among the following:I. The lower thermal conductivity of the plastic wrap over casserole 1 will suppress heat loss by conduction better than aluminum foil.II. In each case heat loss by convection is suppressed, so the finaltemperatures will be the same.III. The high reflectivity of the aluminum foil over casserole 2will suppress heat loss by radiation, while the heat lossesby conduction and convection for casseroles 1 and 2 will besimilar.
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
Two identical bowls of casserole need to be
kept warm. The cook covers bowl 1 with transparent plastic wrap
and bowl 2 with shiny aluminum foil, in each case trapping a layer
of air between the covering and the casserole. (a) After a few minutes, will the temperature of casserole 1 be greater than, less than,
or equal to the temperature of casserole 2? (b) Choose the best
explanation from among the following:
I. The lower thermal conductivity of the plastic wrap over casserole 1 will suppress heat loss by
II. In each case heat loss by
temperatures will be the same.
III. The high reflectivity of the aluminum foil over casserole 2
will suppress heat loss by
by conduction and convection for casseroles 1 and 2 will be
similar.
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