A beaker of water at 60 °C is left in a room at 20 °C. After a long time, the water temperature is 20 °C. No more net energy transfer occurs between the wat...
Question 1 Report
A beaker of water at 60 °C is left in a room at 20 °C. After a long time, the water temperature is 20 °C. No more net energy transfer occurs between the water and the room. What is this condition called?
Answer Details
When two objects at different temperatures are in thermal contact, energy transfers from the hotter object to the cooler one. This continues until both objects reach the same temperature. Once the temperatures are equal, there is no net transfer of energy between them. This condition is called thermal equilibrium.
In this scenario, the water starts at 60 °C and the room is at 20 °C. Energy transfers from the warmer water to the cooler surroundings until the water cools to 20 °C. At that point, water and room are at the same temperature and no further net energy flow occurs.
Absolute zero is the lowest possible temperature (-273 °C), not a condition of energy balance. Boiling point refers to a specific phase-change temperature. Thermal insulation is a property of a material that slows heat transfer - it does not describe the state of equal temperatures.
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