Chemistry Gases DUHS 2023
PMDC Verified Question 26 of 65
Which of the following temperatures is referred to as the absolute zero?
A
-273.16 °C
B
-273.16 K
C
0 °C
D
32 °F
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: -273.16 °C
Concept:

Absolute zero is the theoretical temperature at which a thermodynamic system possesses the lowest possible energy, and the kinetic motion of ideal gas particles ceases entirely.

Solution:

  • On the Kelvin scale, this absolute foundational baseline is defined exactly as 0 K.


  • To convert Kelvin to Celsius, we use the formula: \( ^\circ C = K - 273.15 \).


  • Therefore, 0 K is equivalent to -273.15 °C (often written as -273.16 °C depending on the specific historic triple-point definitions used in some older texts).


  • (Note: -459.67 °F on the Fahrenheit scale).


Why other options are incorrect:

  • Option B: The Kelvin scale does not have negative numbers; 0 K is the absolute bottom.
  • Option C & D: 0°C (and its equivalent 32°F) is merely the freezing point of water, a state where molecules still possess immense kinetic energy compared to absolute zero.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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