Answer
$-268.95^\circ\text{C}$
Work Step by Step
The conversion formula between Kelvin and Celsius degrees:
$C=K-273.15$
We calculate:
$4.2K-273.15=-268.95^\circ\text{C}$
So liquid helium boils at $-268.95^\circ\text{C}$.
Chemistry: The Science in Context (4th Edition)
by Gilbert, Thomas R.; Kirss, Rein V.
Published by
W.W. Norton & Co.
ISBN 10:
0393124177
ISBN 13:
978-0-39312-417-0
Chapter 1 - Matter and Energy: The Origin of the Universe - Problems - Page 38: 79
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