Which statement correctly describes heat resistance as related to mass and surface area?

Which statement correctly describes heat resistance as related to mass and surface area?

• A. The more surface area relative to mass, the more heat resistant
• B. Heat resistance is unaffected by surface area
• C. The more mass relative to exposed surface area, the more it is resistant to heat
• D. Heat flows depend only on material temperature

Answer: (C)

Heat moves through a body mainly by how much area is exposed and how much heat the body can store. A larger mass gives you more thermal mass, so it takes more heat to change the body's temperature. If the exposed surface area is small compared to the mass, there are fewer pathways for heat to enter or leave, so the temperature changes slowly. In short, a high mass-to-exposed-surface-area ratio makes something more resistant to heat flow. Increasing surface area relative to mass would make heat transfer happen more quickly, not more slowly. Heat flow depends on area, temperature difference, and material properties, not just the current temperature.

Heat moves through a body mainly by how much area is exposed and how much heat the body can store. A larger mass gives you more thermal mass, so it takes more heat to change the body's temperature. If the exposed surface area is small compared to the mass, there are fewer pathways for heat to enter or leave, so the temperature changes slowly. In short, a high mass-to-exposed-surface-area ratio makes something more resistant to heat flow. Increasing surface area relative to mass would make heat transfer happen more quickly, not more slowly. Heat flow depends on area, temperature difference, and material properties, not just the current temperature.