PhysicsChapter 1: Heat Capacity and Modes of Heat Transfer
Rate of Cooling
Definition
Rate of Cooling
The **rate of cooling** describes how quickly an object's temperature decreases. Cooling is generally faster when the object's temperature is much higher than its surroundings. As the object's temperature approaches room temperature, the temperature difference becomes smaller and cooling slows.
Cooling Curve
A temperature-time graph can show cooling behaviour. **Steep slope → rapid temperature change Shallow slope → slower temperature change**
Factors
* temperature difference; * exposed area; * airflow; surface properties; container; * surroundings.
Newton's Cooling Idea
Under suitable conditions, cooling rate is approximately proportional to the temperature difference between an object and its surroundings.
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BIG ΔT
- Faster cooling
SMALL ΔT
- Slower
STEEP GRAPH
- Fast