Mechanical convection refers to the movement of fluid (like air or liquid) caused by external forces, such as stirring or the application of heat. In the options you've provided:
A) Cooking steaks on a charcoal grill - This involves radiation and conduction, but not mechanical convection.
B) Popping a bag of popcorn in the microwave - This primarily involves microwave radiation and does not represent mechanical convection.
C) Stirring a thick soup on a stovetop - This involves moving the soup around and creating circulation within it, which is a clear example of mechanical convection.
D) Baking a cake in a glass baking dish - While air circulation may occur in an oven, this is more a case of natural convection (caused by temperature differences) rather than mechanical convection.
The correct answer is C) Stirring a thick soup on a stovetop.
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