To convert the temperature from Kelvin (K) to degrees Celsius (°C), you can use the formula:
\[ °C = K - 273.15 \]
For liquid nitrogen boiling at 77 K:
\[ °C = 77 - 273.15 = -196.15 \]
Rounding this to the nearest integer, the temperature in degrees Celsius is:
\[ -196 \]
Thus, the temperature of liquid nitrogen in degrees Celsius is -196 °C.