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Which of the following corresponds to a temperature of zero on the Kelvin scale?
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1. Intro to General Chemistry
Temperature
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Which of the following best describes the temperature in outer space (far from stars and planets)?
A
It is exactly 0 K, the absolute zero.
B
It is approximately 273 K, the freezing point of water.
C
It is close to absolute zero, around 2.7 K due to the cosmic microwave background.
D
It is about 1000 K because of solar radiation.
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Understand that temperature is a measure of the average kinetic energy of particles in a substance or environment.
Recognize that outer space, far from stars and planets, is nearly a vacuum with very few particles to have kinetic energy, so its temperature is extremely low.
Recall that the cosmic microwave background radiation permeates all of space and has a temperature of about 2.7 K, which sets a baseline temperature for the universe.
Note that absolute zero (0 K) is the theoretical lowest temperature where particles have minimal motion, but space is not exactly 0 K because of this background radiation.
Conclude that the temperature in outer space is close to absolute zero, approximately 2.7 K, due to the cosmic microwave background, rather than being exactly 0 K or much higher.
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