Why does aluminum foil keep food warm?

🧠 Detailed Explanation (For Older Kids)

Aluminum foil is shiny and smooth, which helps it reflect heat really well. When you wrap food in it, the foil bounces the heat back to the food, keeping it nice and warm. It’s like having a little cozy blanket for your leftovers! This is why when you open a foil-wrapped dish, you can feel the warmth inside.