Explanations:Relative humidity (RH) is a crucial factor in determining the likelihood of rainfall. It is defined as the ratio of the partial pressure of water vapor in the air to the saturation vapor pressure at the same temperature. When the air is saturated, the relative humidity is 100%, and this is the condition under which condensation and precipitation are most likely to occur.
Understanding the relationship between relative humidity and rainfall involves recognizing that higher RH levels indicate a higher moisture content in the air. As the air approaches saturation, the likelihood of rainfall increases because the air can no longer hold the excess water vapor, leading to condensation and the formation of clouds and precipitation.
Among the given options, Mumbai has the highest relative humidity at 85%. This high RH level suggests that the air is nearly saturated with water vapor, making it more likely for condensation to occur and for rainfall to happen. In contrast, the other cities have lower RH levels, which are less conducive to rainfall. Delhi has a RH of 50%, which is relatively low and indicates that the air is not close to saturation. Chennai has a RH of 70%, which is higher but still not as high as Mumbai's. Nagpur has a RH of 60%, which is moderate and does not indicate a high likelihood of rainfall compared to Mumbai.
It is important to note that while relative humidity is a significant factor in predicting rainfall, it is not the only factor. Other meteorological conditions such as temperature, air pressure, and wind patterns also play a role in determining whether rainfall will occur. However, in the context of this question, the relative humidity levels provide a clear indication of which location is most likely to experience rainfall.