When a cold drink is left sitting in a hot room, which of the following best describes what happens to its temperature over time?

• A. The temperature of the drink fluctuates randomly without reaching equilibrium.
• B. The temperature of the drink remains constant and does not change.
• C. The temperature of the drink decreases further below its initial temperature.
• D. The temperature of the drink increases until it reaches thermal equilibrium with the room.

Answer: (D)

Verified step by step guidance

1. Understand the concept of thermal equilibrium: When two objects at different temperatures are in contact, heat flows from the hotter object to the cooler one until both reach the same temperature.
2. Identify the initial conditions: The cold drink has a lower temperature than the hot room, so heat will flow from the room to the drink.
3. Apply the principle of heat transfer: The drink absorbs heat energy from the surrounding air, causing its temperature to rise over time.
4. Recognize that the temperature will not fluctuate randomly or remain constant because energy transfer is directional and continuous until equilibrium is reached.
5. Conclude that the drink's temperature increases gradually until it matches the room temperature, achieving thermal equilibrium.