Topic: Heat Transfer
Your finger sticks to an ice tray just taken from the refrigerator. Which factor has more effect on this phenomenon?
- A. The inside temperature of the freezer
- B. The humidity of the air
- C. The heat capacity of both your finger and the tray
- D. The thermal conductivity of the tray
Answer: D. The thermal conductivity of the tray
Explanation: Metal is a very good conductor of heat. When you touch the cold metal ice tray, heat is rapidly transferred from your fingers due to the tray's high thermal conductivity. This sudden heat loss freezes the thin film of moisture between your finger and the tray, causing it to stick.