Answer to Question #295515 in General Chemistry for jnkj

Question

SEP Interpret Data At the salt factory described in Question 3, how could the manager use only temperature readings to determine when the salt in the vat has changed into one giant crystal?

Answer 1

Heat transfer is a dynamic process in which heat is transferred spontaneously from one body to 

another cooler body.

For heat transfer:

$\text{ rate of heat transfer} =$ $\dfrac{\text{temperature difference}}{\text{over heat flow resistance of medium}}$

During processing, temperatures may change and therefore the rate of heat transfer will change in a process called unsteady-state heat transfer, contrary to steady-state heat transfer when the temperatures do not change.

Due to thermal conductivity, the temperature remains steady at $801°C$ for the two hours. The thermal conductivity of the water of effervescence in salt remains fairly constant.