The small droplets of water that form on the grass in the early hours of the morning is

Analysis

The question asks for the scientific term for the small water droplets that appear on grass during the early morning. This is a classic question on Thermal Physics, specifically focusing on the change of state and atmospheric conditions.

Concept Explanation

To understand this, we look at the concept of Condensation and the Dew Point:

1. Water Vapor in the Air: The atmosphere always contains some amount of water vapor (invisible gas).
2. Temperature Drop: During the night, the temperature of the air and the surfaces (like grass) drops significantly.
3. Saturation: As the air cools, its ability to hold water vapor decreases. Eventually, the air reaches a temperature called the Dew Point, where it becomes saturated (it cannot hold any more water vapor).
4. Condensation: When the temperature falls below the dew point, the excess water vapor in the air condenses into liquid water droplets on cool surfaces like grass, leaves, and metal. This phenomenon is known as Dew.

Let's look at the other options to clarify why they are incorrect:

• Fog/Mist: These are clouds of water droplets suspended in the air near the ground. They are not droplets on the grass, but rather a suspension in the atmosphere that reduces visibility.
• Hail: This is a form of solid precipitation (ice pellets) that falls from clouds during thunderstorms, not a morning surface phenomenon.

Step-by-Step Solution

1. Identify the location of the droplets: The question specifies the droplets are on the grass.
2. Identify the timing: The question specifies early hours of the morning (when temperatures are lowest).
3. Apply the principle: The cooling of the earth's surface causes water vapor in the immediate vicinity to lose kinetic energy and change from gas to liquid (condensation).
4. Match with terminology: The specific term for this condensation on surfaces is "Dew."

Conclusion

Based on the physical process of condensation occurring on surfaces due to cooling, the correct term is Dew.

Exam Tip: Remember the "D-D-D" rule for this topic: Dew forms when the temperature drops to the Dew point, causing Deposition or condensation of water vapor.