A sample of water is heated from 15 degrees Celsius to 35 degrees Celsius. What is the temperature change in Kelvin?
The temperature change is 20 K.
To determine the temperature change in Kelvin, when a sample of water is heated from 15 degrees Celsius to 35 degrees Celsius, follow these steps:
- First, understand that the Kelvin temperature scale is an absolute temperature scale that starts at absolute zero. Importantly for this question, the size of one degree Celsius is exactly equal to the size of one Kelvin. This means that any temperature change in Celsius is numerically equal to the same temperature change in Kelvin.
- Calculate the temperature change in degrees Celsius:
- Initial temperature: \(15^\circ C\)
- Final temperature: \(35^\circ C\)
- Temperature change = Final - Initial = \(35^\circ C - 15^\circ C = 20^\circ C\)
- Since \(1^\circ C = 1 \, \text{K}\), the temperature change in Kelvin will also be:
- Temperature change = \(20 \, \text{K}\)
- Thus, the temperature change from 15 degrees Celsius to 35 degrees Celsius is \(20 \, \text{K}\).
Therefore, the correct answer is: The temperature change is 20 K.
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