Question

identifying direction of heat flow
indicate the direction of heat flow in each scenario.
scenario a:
scenario b:
scenario c:
scenario d:
scenario object 1 object 2
a lotion at 27°c skin at 37°c
b lasagna at 170°c plate at 20°c
c ocean water at 25°c lava at 950°c
d eggs at 2°c sidewalk at 80°c

Explanation:

Step1: Recall heat - flow principle

Heat flows from a higher - temperature object to a lower - temperature object.

Step2: Analyze Scenario A

Skin ($37^{\circ}C$) is at a higher temperature than lotion ($27^{\circ}C$), so heat flows from skin to lotion.

Step3: Analyze Scenario B

Lasagna ($170^{\circ}C$) is at a higher temperature than the plate ($20^{\circ}C$), so heat flows from lasagna to plate.

Step4: Analyze Scenario C

Lava ($950^{\circ}C$) is at a much higher temperature than ocean water ($25^{\circ}C$), so heat flows from lava to ocean water.

Step5: Analyze Scenario D

Sidewalk ($80^{\circ}C$) is at a higher temperature than eggs ($2^{\circ}C$), so heat flows from sidewalk to eggs.

Answer:

Scenario A: Skin to Lotion
Scenario B: Lasagna to Plate
Scenario C: Lava to Ocean Water
Scenario D: Sidewalk to Eggs