Question

What is meant by subzero teperatures?

Answer 1

In Fahrenheit, zero has no particular significance, but it is not uncommon to say sub-zero temperatures to emphasize the coldness (0°F is about -17.78°C). In some fields of physics, a "subzero temperature" may even mean a temperature below 0 Kelvin, see e.g. the Wikipedia article on negative temperatures

Answer 2

Answer:

Sub-zero temperatures are below 0° centigrade or, in the United States, below 0° Fahrenheit.

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