10/01/2025 Lab

The experiment involves measuring the temperature of a mixture consisting of ice and water.
Temperature is measured every thirty seconds until all the ice melts.
Final measurement taken after all ice is gone, questioning whether temperature increases linearly.

Initial temperature at the beginning and final temperature at $30^{ ext{°C}}$ after all ice melted.
Focus on temperature changes during the melting process:
- When ice is present, temperature remains constant until all ice has melted.
- The temperature during the melting does not increase until all solid ice transforms into liquid.

Defined as the heat added to or removed from a substance that results in temperature change.
Example: Adding heat to a kilogram of ice.
- 1 kilocalorie raises the temperature of 1 kg of ice by $1^{ ext{°C}}$.
- Adding 80 kilocalories heats the ice by $80^{ ext{°C}}$, transitioning from $0^{ ext{°C}}$ to $80^{ ext{°C}}$.
Practical Scenario: A warm room warming a block of ice on a table.
- Heat is drawn from the air surrounding the block, indicating that it is heat being sensed by the observer.

Introduces a hot plate to melt ice with sensible heat.
Latent heat of melting: Defined at $80 ext{ kilocalories}$ per kilogram of ice.
Total heat added to melt the ice, which leads to a liter of water being maintained at a certain heat level.
- Temperature does not change when transitioning from ice to water; rather, state changes from ice to liquid water.
If energy is removed, the water would turn back into ice without altering the temperature, indicating the existence of latent heat.

Emphasizes the necessity of adding heat to change ice into water.
- Statement: "There’s no way to change ice to water without adding heat."
All water contains latent heat due to this process.

Discusses the effect of salt water on melting ice.
Salt water freezes at a temperature below $0^{ ext{°C}}$.
Ice in salt water is melting: requires energy as the heat from the water is transferred to the ice.

Conceptual connection between financial accounting and energy accounting:
- Just as money doesn't disappear, heat doesn't just vanish – it must be accounted for.
- Heat transferred during the melting process is similar to financial transactions.

Clarifies the difference between sensible heat and latent heat:
- Sensible heat (temperature change) vs. Latent heat (phase change without temperature change).
When the ice melts, the heat transitions from being sensible to latent heat.

Importance of accounting for heat when analyzing temperature changes and phase transitions in mixtures.
Adds an experiential twist to understanding thermodynamic principles by relating to real-world concepts (e.g., finance).

Understanding heat transfer has applications in various fields such as physics, chemistry, environmental science, and even economics in terms of resource management.
Highlighted the fundamental nature of energy transformation within physical systems and relates it to everyday experiences.