What most likely happened when Isaac held a marshmallow on a skewer over a fire?

When Isaac held the marshmallow on a skewer over the fire, thermal energy in the form of heat moved from the fire to the skewer and then to the marshmallow. This process illustrates the principle of heat transfer by conduction and convection.

As the flames emit heat, the air surrounding the fire becomes hot, and this hot air rises, creating a convection current. The skewer, being a solid object, absorbs this thermal energy from the hot air and the direct contact with the fire. The heat then travels along the skewer to the marshmallow, causing it to cook.

This scenario demonstrates how energy moves from a hotter object or medium (the fire) to cooler objects (the skewer and marshmallow), emphasizing the role of thermal conduction within solids and convection within fluids (like the heated air). This is a key concept in understanding heat transfer during cooking processes.