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A temperature of $27\,^\circ\text{C}$ is recorded. What is this temperature on the kelvin scale?
A$27\ \text{K}$
B$300\ \text{K}$
C$273\ \text{K}$
D$246\ \text{K}$
Answer & Solution
Correct answer: B. $300\ \text{K}$
1. The relation between Celsius and kelvin is $K = C + 273$.
2. Substitute $C = 27$: $K = 27 + 273$.
3. So the temperature is $300$ K.
4. Subtracting instead of adding gives $246$ K, a sign-handling trap.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 3 Thermal Physics "Temperature", p.39_
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