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Why does ice form on bridges even if the temperature is above freezing?

Why does ice form on bridges even if the temperature is above freezing?

Grade:11

1 Answers

Apoorva Arora IIT Roorkee
askIITians Faculty 181 Points
5 years ago
The lowest temperature a wet object can reach is what is called the "wet-bulb temperature." This can be several degrees lower than the "dry-bulb temperature," the amount can vary depending on the humidity (specifically atmospheric pressure). If that wet-bulb temperature gets below 0°C, then freezing is possible.
In order for said wet object to get close to the wet-bulb temperature, someconvectionneeds to occur in order to take that evaporated water away (i.e. wind).
This is one of the ways wind under a bridge can cause freezing under the right conditions.

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