How many times might the rate of corrosion of steel increase when the temperature rises from 60°F to 140°F?

The correct answer indicates that the rate at which steel corrodes can increase significantly with rising temperatures. This phenomenon is based on electrochemical principles, where higher temperatures typically accelerate the reactions involved in corrosion processes. When the temperature rises from 60°F to 140°F, it creates more energy for corrosion reactions to occur.

In this particular temperature range, studies and observations show that for many metals, including steel, the corrosion rate can double with every 10°C (approximately 18°F) increase in temperature. Thus, going from 60°F (about 15.6°C) to 140°F (about 60°C) represents a substantial temperature increase, leading to a multiplicative effect on the corrosion rate.

Taking into account these principles and typical empirical findings related to corrosion rates in various environments, it is understood that for this specific rise in temperature, the general estimate for increased corrosion would fall within the multiples indicated by the correct choice, which estimates an increase by a factor of 3 to 5 times. This aligns with the expectations from scientific studies on corrosion rates affected by temperature, making it a logical and accurate conclusion.