Question

On the Celsius scale the absolute zero of temperature is at:

• A. $0^{\circ }C$
• B. $-{32}^{\circ }C$
• C. ${100}^{\circ }C$
• D. $-{273.15}^{\circ }C$

Answer 1

The correct option is D $-{273.15}^{\circ }C$

Using the temperature conversions:
$C=273.15+K$
where:
$C:\text{Magnitude in Celcius Scale}$
$K:\text{Magnitude in Kelvin Scale}$

Absolute zero is the lowest limit of temperature in universe and occurs at $0K$. Converting to celcius scale, we get:
$0=273.15+C$
$C=-273.15$

Hence, absolute zero occurs at $-{273.15}^{\circ }C$