Evaporation at Room Temperature
Evaporation is the process by which a liquid changes into a gas or vapor at temperatures lower than its boiling point. Even though the boiling point of water is 100 degrees Celsius, water can still evaporate at room temperature. This phenomenon occurs due to the following reasons:

1. Temperature Variation
- Room temperature is an average temperature range, and the actual temperature can vary throughout the day and in different locations.
- Even at room temperature, some water molecules can gain enough energy to break free from the liquid's surface and evaporate into the air.

2. Energy Transfer
- Evaporation is a cooling process that requires energy. When water molecules evaporate from the surface, they take away heat energy, cooling the remaining liquid.
- This energy transfer allows some water molecules to escape into the air as vapor, even at lower temperatures.

3. Surface Area
- The rate of evaporation increases with the surface area of the liquid exposed to the air. In a glass of water, only the surface molecules can evaporate, but in a larger body of water like a lake, more molecules have the opportunity to escape.

4. Humidity
- The rate of evaporation is also influenced by the humidity of the surrounding air. In dry air, water molecules can easily evaporate, while in humid conditions, the air is already saturated with water vapor, slowing down the evaporation process.
In conclusion, even though the boiling point of water is 100 degrees Celsius, water can still evaporate at room temperature due to temperature variations, energy transfer, surface area, and humidity levels. These factors allow water molecules to escape from the liquid and enter the air as vapor.