Final answer:
The lowest temperature measured by a radiosonde is approximately -18°C (or 0°F). The lowest temperatures ever recorded in a laboratory experiment were 4.5 x 10^-10 K and 1.0 x 10^-10 K. The Penzias and Wilson experiment found a temperature of 3.5 K and a more accurate reading of 2.73 K.
Step-by-step explanation:
The lowest temperature measured by a radiosonde is approximately -18°C (or 0°F).
The lowest temperatures ever recorded in a laboratory experiment were 4.5 x 10-10 K and 1.0 x 10-10 K.
Additionally, the Penzias and Wilson experiment found a temperature of 3.5 K and a more accurate reading of 2.73 K.