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Chapter 9: Problem 2

What must be true of two objects if the objects are in a state of thermal equilibrium?

Short Answer

Expert verified
For two objects to be in thermal equilibrium, they must have the same temperature.

Step by step solution

01

Understand the Concept

Thermal equilibrium is a state when two objects in physical contact with each other exchange no heat energy. This means the objects are at the same temperature and there is no net flow of thermal energy between the objects.
02

Deduce the Condition

Given this definition, for two objects to be in thermal equilibrium, they must have the same temperature.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Temperature
Temperature is a measure that tells us how hot or cold something is. It is a simple yet powerful concept that relates to the energy of motion in the molecules of a substance. When we talk about temperature, we are actually referring to how fast the molecules are moving inside a substance.
  • Higher temperature: Molecules move rapidly.
  • Lower temperature: Molecules move slowly.
This movement translates to what we perceive as heat or the lack thereof. It's crucial to remember that temperature is not energy itself, but an indicator of thermal energy level. When two objects are at the same temperature, they are said to be in thermal equilibrium, meaning no net heat flows between them.
Heat Energy
Heat energy is the form of energy that is transferred between objects due to a temperature difference. This energy plays a critical role in our daily lives as it is involved in everything from our body temperature regulation to the functioning of appliances.
  • Heat flows from a hotter object to a cooler one until equilibrium is reached.
  • Measured in joules or calories, heat energy is dependent on the mass and specific heat capacity of objects.
During a state of thermal equilibrium, even if objects contain different amounts of internal energy due to differing masses or specific kinds of material, no more heat energy will flow between them when they are at the same temperature.
Net Flow of Thermal Energy
The net flow of thermal energy is a concept that describes the direction and process of heat transfer between two substances. It is the flow that occurs due to the difference in temperature between two objects.
When this flow takes place:
  • Energy transfers from the hotter object to the cooler object.
  • It continues until both objects reach the same temperature.
This flow is driven by the natural tendency of systems to move towards thermal equilibrium. Once equilibrium is achieved, the net flow of thermal energy ceases, leading to a balance where no additional heat transfers between the two objects.

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Most popular questions from this chapter

How does air within winter clothing keep you warm on cold winter days?

Why are the steam and ice points of water better fixed points for a thermometer than the temperature of a human body?

Given any two bodies, the one with the higher temperature contains more heat. What is wrong with this statement?

The freezing and boiling points of water on the imaginary "Too Hot" temperature scale are selected to be exactly 50 and 200 degrees TH. a. Derive an equation relating the Too Hot scale to the Celsius scale. (Hint: Make a graph of one temperature scale versus the other, and solve for the equation of the line.) b. Calculate absolute zero in degrees TH.

Which object in each of the following pairs has greater total internal energy, assuming that the two objects in each pair are in thermal equilibrium? Explain your reasoning in each case. a. a metal knife in thermal equilibrium with a hot griddle b. a \(1 \mathrm{kg}\) block of ice at \(-25^{\circ} \mathrm{C}\) or seven \(12 \mathrm{g}\) ice cubes at \(-25^{\circ} \mathrm{C}\)
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